/// <summary>
/// /// Fills all cell values of the given vector into a bin from which statistics measures can be retrieved efficiently.
/// Cells values are copied.
/// </summary>
/// <param name="vector">the vector to analyze.</param>
/// <returns>a bin holding the statistics measures of the vector.</returns>
/// <example>
/// Tip: Use <i>Console.WriteLine(bin(vector))</i> to print most measures computed by the bind Example:
/// <table>
/// <td class="PRE">
/// <pre>
/// Size: 20000
/// Sum: 299858.02350278624
/// SumOfSquares: 5399184.154095971
/// Min: 0.8639113139711261
/// Max: 59.75331890541892
/// Mean: 14.992901175139313
/// RMS: 16.43043540825375
/// Variance: 45.17438077634358
/// Standard deviation: 6.721188940681818
/// Standard error: 0.04752598277592142
/// Geometric mean: 13.516615397064466
/// Product: Infinity
/// Harmonic mean: 11.995174297952191
/// Sum of inversions: 1667.337172700724
/// Skew: 0.8922838940067878
/// Kurtosis: 1.1915828121825598
/// Sum of powers(3): 1.1345828465808412E8
/// Sum of powers(4): 2.7251055344494686E9
/// Sum of powers(5): 7.367125643433887E10
/// Sum of powers(6): 2.215370909100143E12
/// Moment(0,0): 1.0
/// Moment(1,0): 14.992901175139313
/// Moment(2,0): 269.95920770479853
/// Moment(3,0): 5672.914232904206
/// Moment(4,0): 136255.27672247344
/// Moment(5,0): 3683562.8217169433
/// Moment(6,0): 1.1076854545500715E8
/// Moment(0,mean()): 1.0
/// Moment(1,mean()): -2.0806734113421045E-14
/// Moment(2,mean()): 45.172122057305664
/// Moment(3,mean()): 270.92018671421
/// Moment(4,mean()): 8553.8664869067
/// Moment(5,mean()): 153357.41712233616
/// Moment(6,mean()): 4273757.570142922
/// 25%, 50% and 75% Quantiles: 10.030074811938091, 13.977982089912224,
/// 18.86124362967137
/// quantileInverse(mean): 0.559163335012079
/// Distinct elements & frequencies not printed (too many).
/// </pre>
/// </td>
/// </table>
/// </example>
public static DynamicBin1D Bin(DoubleMatrix1D vector)
{
DynamicBin1D bin = new DynamicBin1D();
bin.AddAllOf(new DoubleArrayList(DoubleFactory1D.Dense.ToList(vector).ToArray()));
return(bin);
}
/// <summary>
/// Sorts the matrix rows into ascending order, according to the <i>natural ordering</i> of the matrix values in the given column.
/// </summary>
/// <param name="matrix">
/// The matrix to be sorted.
/// </param>
/// <param name="column">
/// The index of the column inducing the order.
/// </param>
/// <returns>
/// A new matrix view having rows sorted by the given column.
/// </returns>
/// <exception cref="IndexOutOfRangeException">
/// If <i>column < 0 || column >= matrix.columns()</i>.
/// </exception>
public DoubleMatrix2D Sort(DoubleMatrix2D matrix, int column)
{
if (column < 0 || column >= matrix.Columns)
{
throw new IndexOutOfRangeException("column=" + column + ", matrix=" + AbstractFormatter.Shape(matrix));
}
var rowIndexes = new int[matrix.Rows]; // row indexes to reorder instead of matrix itself
for (int i = rowIndexes.Length; --i >= 0;)
{
rowIndexes[i] = i;
}
DoubleMatrix1D col = matrix.ViewColumn(column);
RunSort(
rowIndexes,
0,
rowIndexes.Length,
(a, b) =>
{
double av = col[a];
double bv = col[b];
if (Double.IsNaN(av) || Double.IsNaN(bv))
{
return(CompareNaN(av, bv)); // swap NaNs to the end
}
return(av < bv ? -1 : (av == bv ? 0 : 1));
});
// view the matrix according to the reordered row indexes
// take all columns in the original order
return(matrix.ViewSelection(rowIndexes, null));
}
/// <summary>
/// Sorts the vector into ascending order, according to the <i>natural ordering</i>.
/// </summary>
/// <param name="vector">
/// The vector to be sorted.
/// </param>
/// <returns>
/// A new sorted vector (matrix) viewd
/// </returns>
public DoubleMatrix1D Sort(DoubleMatrix1D vector)
{
var indexes = new int[vector.Size]; // row indexes to reorder instead of matrix itself
for (int i = indexes.Length; --i >= 0;)
{
indexes[i] = i;
}
RunSort(
indexes,
0,
indexes.Length,
(a, b) =>
{
double av = vector[a];
double bv = vector[b];
if (Double.IsNaN(av) || Double.IsNaN(bv))
{
return(CompareNaN(av, bv)); // swap NaNs to the end
}
return(av < bv ? -1 : (av == bv ? 0 : 1));
});
return(vector.ViewSelection(indexes));
}
/// <summary>
/// Constructs and returns the covariance matrix of the given matrix.
/// The covariance matrix is a square, symmetric matrix consisting of nothing but covariance coefficientsd
/// The rows and the columns represent the variables, the cells represent covariance coefficientsd
/// The diagonal cells (i.ed the covariance between a variable and itself) will equal the variances.
/// The covariance of two column vectors x and y is given by <i>cov(x,y) = (1/n) * Sum((x[i]-mean(x)) * (y[i]-mean(y)))</i>.
/// See the <A HREF="http://www.cquest.utoronto.ca/geog/ggr270y/notes/not05efg.html"> math definition</A>.
/// Compares two column vectors at a timed Use dice views to compare two row vectors at a time.
/// </summary>
/// <param name="matrix">any matrix; a column holds the values of a given variable.</param>
/// <returns>the covariance matrix (<i>n x n, n=matrix.Columns</i>).</returns>
public static DoubleMatrix2D Covariance(DoubleMatrix2D matrix)
{
int rows = matrix.Rows;
int columns = matrix.Columns;
DoubleMatrix2D covariance = new DenseDoubleMatrix2D(columns, columns);
double[] sums = new double[columns];
DoubleMatrix1D[] cols = new DoubleMatrix1D[columns];
for (int i = columns; --i >= 0;)
{
cols[i] = matrix.ViewColumn(i);
sums[i] = cols[i].ZSum();
}
for (int i = columns; --i >= 0;)
{
for (int j = i + 1; --j >= 0;)
{
double sumOfProducts = cols[i].ZDotProduct(cols[j]);
double cov = (sumOfProducts - sums[i] * sums[j] / rows) / rows;
covariance[i, j] = cov;
covariance[j, i] = cov; // symmetric
}
}
return(covariance);
}
public void Dsymv(Boolean isUpperTriangular, double alpha, DoubleMatrix2D A, DoubleMatrix1D x, double beta, DoubleMatrix1D y)
{
if (isUpperTriangular)
{
A = A.ViewDice();
}
Property.DEFAULT.CheckSquare(A);
int size = A.Rows;
if (size != x.Size || size != y.Size)
{
throw new ArgumentException(A.ToStringShort() + ", " + x.ToStringShort() + ", " + y.ToStringShort());
}
DoubleMatrix1D tmp = x.Like();
for (int i = 0; i < size; i++)
{
double sum = 0;
for (int j = 0; j <= i; j++)
{
sum += A[i, j] * x[j];
}
for (int j = i + 1; j < size; j++)
{
sum += A[j, i] * x[j];
}
tmp[i] = alpha * sum + beta * y[i];
}
y.Assign(tmp);
}
public void TestViewColumn()
{
var a = DoubleFactory2D.Dense.Ascending(5, 4);
DoubleMatrix1D d = a.ViewColumn(0);
Assert.AreEqual(5, d.Size);
Assert.AreEqual(1, d[0]);
Assert.AreEqual(5, d[1]);
Assert.AreEqual(9, d[2]);
Assert.AreEqual(13, d[3]);
Assert.AreEqual(17, d[4]);
var b = new DenseDoubleMatrix2D(new[]
{
new[] { 1d, 0d, 0d, 1d, 0d, 0d, 0d, 0d, 0d },
new[] { 1d, 0d, 1d, 0d, 0d, 0d, 0d, 0d, 0d },
new[] { 1d, 1d, 0d, 0d, 0d, 0d, 0d, 0d, 0d },
new[] { 0d, 1d, 1d, 0d, 1d, 0d, 0d, 0d, 0d },
new[] { 0d, 1d, 1d, 2d, 0d, 0d, 0d, 0d, 0d },
new[] { 0d, 1d, 0d, 0d, 1d, 0d, 0d, 0d, 0d },
new[] { 0d, 1d, 0d, 0d, 1d, 0d, 0d, 0d, 0d },
new[] { 0d, 0d, 1d, 1d, 0d, 0d, 0d, 0d, 0d },
new[] { 0d, 1d, 0d, 0d, 0d, 0d, 0d, 0d, 1d },
new[] { 0d, 0d, 0d, 0d, 0d, 1d, 1d, 1d, 0d },
new[] { 0d, 0d, 0d, 0d, 0d, 0d, 1d, 1d, 1d },
new[] { 0d, 0d, 0d, 0d, 0d, 0d, 0d, 1d, 1d },
});
d = b.ViewColumn(0);
Assert.AreEqual(1, d[0]);
Assert.AreEqual(1, d[1]);
Assert.AreEqual(1, d[2]);
Assert.AreEqual(0, d[3]);
}
/// <summary>
///
/// </summary>
/// <param name="A"></param>
/// <param name="indexes"></param>
/// <param name="work"></param>
/// <returns></returns>
public static DoubleMatrix1D Permute(DoubleMatrix1D A, int[] indexes, double[] work)
{
// check validity
int size = A.Size;
if (indexes.Length != size)
{
throw new IndexOutOfRangeException("invalid permutation");
}
/*
* int i=size;
* int a;
* while (--i >= 0 && (a=indexes[i])==i) if (a < 0 || a >= size) throw new IndexOutOfRangeException("invalid permutation");
* if (i<0) return; // nothing to permute
*/
if (work == null || size > work.Length)
{
work = A.ToArray();
}
else
{
A.ToArray(ref work);
}
for (int i = size; --i >= 0;)
{
A[i] = work[indexes[i]];
}
return(A);
}
/// <summary>
/// Returns a string representation of the given matrix.
/// </summary>
/// <param name="matrix">
/// The matrix to convert.
/// </param>
/// <returns>
/// A string representation of the given matrix.
/// </returns>
public string ToString(DoubleMatrix1D matrix)
{
DoubleMatrix2D easy = matrix.Like2D(1, matrix.Size);
easy.ViewRow(0).Assign(matrix);
return(ToString(easy));
}
/// <summary>
/// Outer product of two vectors; Sets <i>A[i,j] = x[i] * y[j]</i>.
/// </summary>
/// <param name="x">the first source vector.</param>
/// <param name="y">the second source vector.</param>
/// <param name="A">the matrix to hold the resultsd Set this parameter to <i>null</i> to indicate that a new result matrix shall be constructed.</param>
/// <returns>A (for convenience only).</returns>
public static DoubleMatrix2D MultOuter(DoubleMatrix1D x, DoubleMatrix1D y, DoubleMatrix2D A)
{
int rows = x.Size;
int columns = y.Size;
if (A == null)
{
A = x.Like2D(rows, columns);
}
if (A.Rows != rows || A.Columns != columns)
{
throw new ArgumentException();
}
for (int row = rows; --row >= 0;)
{
A.ViewRow(row).Assign(y);
}
for (int column = columns; --column >= 0;)
{
A.ViewColumn(column).Assign(x, BinaryFunctions.Mult);
}
return(A);
}
/// <summary>
/// Outer product of two vectors; Returns a matrix with <i>A[i,j] = x[i] * y[j]</i>.
/// </summary>
/// <param name="x">the first source vector.</param>
/// <param name="y">the second source vector.</param>
/// <returns>the outer product </i>A</i>.</returns>
private static DoubleMatrix2D XMultOuter(DoubleMatrix1D x, DoubleMatrix1D y)
{
DoubleMatrix2D A = x.Like2D(x.Size, y.Size);
MultOuter(x, y, A);
return(A);
}
/// <summary>
/// Assigns the result of a function to each cell; <tt>x[i] = function(x[i],y[i])</tt>.
/// (Iterates downwards from <tt>[size()-1]</tt> to <tt>[0]</tt>).
/// </summary>
/// <param name="y">
/// The secondary matrix to operate on.
/// </param>
/// <param name="function">
/// The function taking as first argument the current cell's value of <tt>this</tt>,
/// and as second argument the current cell's value of <tt>y</tt>.
/// </param>
/// <returns>
/// <tt>this</tt> (for convenience only).
/// </returns>
/// <exception cref="ArgumentOutOfRangeException">
/// If <tt>size() != y.size()</tt>.
/// </exception>
public override DoubleMatrix1D Assign(DoubleMatrix1D y, DoubleDoubleFunction function)
{
// overriden for performance only
if (!(y is DenseDoubleMatrix1D))
{
return(base.Assign(y, function));
}
var other = (DenseDoubleMatrix1D)y;
CheckSize(y);
double[] elems = Elements;
double[] otherElems = other.Elements;
if (elems == null || otherElems == null)
{
throw new ApplicationException();
}
int s = Stride;
int ys = other.Stride;
int index = this.Index(0);
int otherIndex = other.Index(0);
// specialized for speed
for (int k = Size; --k >= 0;)
{
elems[index] = function(elems[index], otherElems[otherIndex]);
index += s;
otherIndex += ys;
}
return(this);
}
/// <summary>
/// Update the SVD with the addition of a new column.
/// </summary>
/// <param name="c">
/// The new column.
/// </param>
/// <param name="wantV">
/// Whether the matrix V is needed.
/// </param>
public void Update(DoubleMatrix1D c, bool wantV)
{
int nRows = c.Size - _m;
if (nRows > 0)
{
_u = DoubleFactory2D.Dense.AppendRows(_u, new SparseDoubleMatrix2D(nRows, _n));
_m = c.Size;
}
else if (nRows < 0)
{
c = DoubleFactory1D.Sparse.AppendColumns(c, DoubleFactory1D.Sparse.Make(-nRows));
}
var d = DoubleFactory2D.Dense.Make(c.ToArray(), c.Size);
// l = U'd is the eigencoding of d
var l = _u.ViewDice().ZMult(d, null);
////var uu = _u.ZMult(_u.ViewDice(), null);
// Ul = UU'd
////var ul = uu.ZMult(d, null);
var ul = _u.ZMult(l, null);
// h = d - UU'd = d - Ul is the component of d orthogonal to the subspace spanned by U
////var h = d.Copy().Assign(uu.ZMult(d, null), BinaryFunctions.Minus);
////var h = d.Copy().Assign(ul, BinaryFunctions.Minus);
// k is the projection of d onto the subspace othogonal to U
var k = Math.Sqrt(d.Aggregate(BinaryFunctions.Plus, a => a * a) - (2 * l.Aggregate(BinaryFunctions.Plus, a => a * a)) + ul.Aggregate(BinaryFunctions.Plus, a => a * a));
// truncation
if (k == 0 || double.IsNaN(k))
{
return;
}
_n++;
// j = d - UU'd = d - Ul is an orthogonal basis for the component of d orthogonal to the subspace spanned by U
////var j = h.Assign(UnaryFunctions.Div(k));
var j = d.Assign(ul, BinaryFunctions.Minus).Assign(UnaryFunctions.Div(k));
// Q = [ S, l; 0, ||h||]
var q =
DoubleFactory2D.Sparse.Compose(
new[] { new[] { S, l }, new[] { null, DoubleFactory2D.Dense.Make(1, 1, k) } });
var svdq = new SingularValueDecomposition(q, true, wantV, true);
_u = DoubleFactory2D.Dense.AppendColumns(_u, j).ZMult(svdq.U, null);
_s = svdq.SingularValues;
if (wantV)
{
_v = DoubleFactory2D.Dense.ComposeDiagonal(_v, DoubleFactory2D.Dense.Identity(1)).ZMult(
svdq.V, null);
}
}
public WrapperDoubleMatrix1D(DoubleMatrix1D newContent)
{
if (newContent != null)
{
Setup(newContent.Count());
}
this.Content = newContent;
}
/// <summary>
/// Fills all cells of the given vector into the given histogram.
/// </summary>
/// <param name="histo"></param>
/// <param name="vector"></param>
/// <returns><i>histo</i> (for convenience only).</returns>
public static Hep.Aida.IHistogram1D Histogram(Hep.Aida.IHistogram1D histo, DoubleMatrix1D vector)
{
for (int i = vector.Size; --i >= 0;)
{
histo.Fill(vector[i]);
}
return(histo);
}
/// <summary>
/// Returns the one-norm of vector <i>x</i>, which is <i>Sum(abs(x[i]))</i>.
/// </summary>
/// <param name="x">
/// The vector x.
/// </param>
/// <returns>
/// The one-norm of x.
/// </returns>
public static double Norm1(DoubleMatrix1D x)
{
if (x.Size == 0)
{
return(0);
}
return(x.Aggregate(BinaryFunctions.Plus, Math.Abs));
}
/// <summary>
/// Returns the dot product of two vectors x and y, which is <tt>Sum(x[i]*y[i])</tt>.
/// Where <tt>x == this</tt>.
/// Operates on cells at indexes <tt>from .. Min(size(),y.size(),from+length)-1</tt>.
/// </summary>
/// <param name="y">
/// The second vector.
/// </param>
/// <param name="from">
/// The first index to be considered.
/// </param>
/// <param name="length">
/// The number of cells to be considered.
/// </param>
/// <returns>
/// The sum of products; zero if <tt>from < 0 || length < 0</tt>.
/// </returns>
public override double ZDotProduct(DoubleMatrix1D y, int from, int length)
{
if (!(y is DenseDoubleMatrix1D))
{
return(base.ZDotProduct(y, from, length));
}
var yy = (DenseDoubleMatrix1D)y;
int tail = from + length;
if (from < 0 || length < 0)
{
return(0);
}
if (Size < tail)
{
tail = Size;
}
if (y.Size < tail)
{
tail = y.Size;
}
int min = tail - from;
int i = Index(from);
int j = yy.Index(from);
int s = Stride;
int ys = yy.Stride;
double[] elems = Elements;
double[] yElems = yy.Elements;
if (elems == null || yElems == null)
{
throw new ApplicationException();
}
double sum = 0;
// optimized
// loop unrolling
i -= s;
j -= ys;
for (int k = min / 4; --k >= 0;)
{
sum += (elems[i += s] * yElems[j += ys]) +
(elems[i += s] * yElems[j += ys]) +
(elems[i += s] * yElems[j += ys]) +
(elems[i += s] * yElems[j += ys]);
}
for (int k = min % 4; --k >= 0;)
{
sum += elems[i += s] * yElems[j += ys];
}
return(sum);
}
public void Dger(double alpha, DoubleMatrix1D x, DoubleMatrix1D y, DoubleMatrix2D A)
{
Cern.Jet.Math.PlusMult fun = new Cern.Jet.Math.PlusMult(0);
for (int i = A.Rows; --i >= 0;)
{
fun.Multiplicator = alpha * x[i];
A.ViewRow(i).Assign(y, fun);
}
}
/// <summary>
/// Replaces all cell values of the receiver with the values of another matrix.
/// </summary>
/// <param name="source">
/// The source matrix to copy from (may be identical to the receiver).
/// </param>
/// <returns>
/// <tt>this</tt> (for convenience only).
/// </returns>
/// <exception cref="ArgumentException">
/// If <tt>size() != other.size()</tt>.
/// </exception>
public override DoubleMatrix1D Assign(DoubleMatrix1D source)
{
// overriden for performance only
if (!(source is DenseDoubleMatrix1D))
{
return(base.Assign(source));
}
var other = (DenseDoubleMatrix1D)source;
if (other == this)
{
return(this);
}
CheckSize(other);
if (!IsView && !other.IsView)
{
// quickest
Array.Copy(other.Elements, 0, Elements, 0, Elements.Length);
return(this);
}
if (HaveSharedCells(other))
{
DoubleMatrix1D c = other.Copy();
if (!(c is DenseDoubleMatrix1D))
{
// should not happen
return(Assign(source));
}
other = (DenseDoubleMatrix1D)c;
}
double[] elems = Elements;
double[] otherElems = other.Elements;
if (Elements == null || otherElems == null)
{
throw new ArgumentException();
}
int s = Stride;
int ys = other.Stride;
int index = this.Index(0);
int otherIndex = other.Index(0);
for (int k = Size; --k >= 0;)
{
elems[index] = otherElems[otherIndex];
index += s;
otherIndex += ys;
}
return(this);
}
public void Drot(DoubleMatrix1D x, DoubleMatrix1D y, double c, double s)
{
x.CheckSize(y);
DoubleMatrix1D tmp = x.Copy();
x.Assign(F1.Mult(c));
x.Assign(y, F2.PlusMult(s));
y.Assign(F1.Mult(c));
y.Assign(tmp, F2.MinusMult(s));
}
/// <summary>
/// Same as <see cref="Cern.Colt.Partitioning.Partition(int[], int, int, int[], int, int, int[])"/>
/// except that it <i>synchronously</i> partitions the rows of the given matrix by the values of the given matrix column;
/// This is essentially the same as partitioning a list of composite objects by some instance variable;
/// In other words, two entire rows of the matrix are swapped, whenever two column values indicate so.
/// <p>
/// Let's say, a "row" is an "object" (tuple, d-dimensional point).
/// A "column" is the list of "object" values of a given variable (field, dimension).
/// A "matrix" is a list of "objects" (tuples, points).
/// <p>
/// Now, rows (objects, tuples) are partially sorted according to their values in one given variable (dimension).
/// Two entire rows of the matrix are swapped, whenever two column values indicate so.
/// <p>
/// Note that arguments are not checked for validity.
///
/// </summary>
/// <param name="matrix">
/// the matrix to be partitioned.
/// </param>
/// <param name="rowIndexes">
/// the index of the i-th row; is modified by this method to reflect partitioned indexes.
/// </param>
/// <param name="rowFrom">
/// the index of the first row (inclusive).
/// </param>
/// <param name="rowTo">
/// the index of the last row (inclusive).
/// </param>
/// <param name="column">
/// the index of the column to partition on.
/// </param>
/// <param name="splitters">
/// the values at which the rows shall be split into intervals.
/// Must be sorted ascending and must not contain multiple identical values.
/// These preconditions are not checked; be sure that they are met.
/// </param>
/// <param name="splitFrom">
/// the index of the first splitter element to be considered.
/// </param>
/// <param name="splitTo">
/// the index of the last splitter element to be considered.
/// The method considers the splitter elements<i>splitters[splitFrom] .d splitters[splitTo]</i>.
/// </param>
/// <param name="splitIndexes">
/// a list into which this method fills the indexes of rows delimiting intervals.
/// Upon return <i>splitIndexes[splitFrom..splitTo]</i> will be set accordingly.
/// Therefore, must satisfy <i>splitIndexes.Length >= splitters.Length</i>.
/// </param>
/// <example>
/// <table border="1" cellspacing="0">
/// <tr nowrap>
/// <td valign="top"><i>8 x 3 matrix:<br>
/// 23, 22, 21<br>
/// 20, 19, 18<br>
/// 17, 16, 15<br>
/// 14, 13, 12<br>
/// 11, 10, 9<br>
/// 8, 7, 6<br>
/// 5, 4, 3<br>
/// 2, 1, 0 </i></td>
/// <td align="left" valign="top">
/// <p><i>column = 0;<br>
/// rowIndexes = {0,1,2,.d,matrix.Rows-1};
/// rowFrom = 0;<br>
/// rowTo = matrix.Rows-1;<br>
/// splitters = {5,10,12}<br>
/// c = 0; <br>
/// d = splitters.Length-1;<br>
/// partition(matrix,rowIndexes,rowFrom,rowTo,column,splitters,c,d,splitIndexes);<br>
/// ==><br>
/// splitIndexes == {0, 2, 3}<br>
/// rowIndexes == {7, 6, 5, 4, 0, 1, 2, 3}</i></p>
/// </td>
/// <td valign="top">
/// The matrix IS NOT REORDERED.<br>
/// Here is how it would look<br>
/// like, if it would be reordered<br>
/// accoring to <i>rowIndexes</i>.<br>
/// <i>8 x 3 matrix:<br>
/// 2, 1, 0<br>
/// 5, 4, 3<br>
/// 8, 7, 6<br>
/// 11, 10, 9<br>
/// 23, 22, 21<br>
/// 20, 19, 18<br>
/// 17, 16, 15<br>
/// 14, 13, 12 </i></td>
/// </tr>
/// </table>
/// </example>
public static void Partition(DoubleMatrix2D matrix, int[] rowIndexes, int rowFrom, int rowTo, int column, double[] splitters, int splitFrom, int splitTo, int[] splitIndexes)
{
if (rowFrom < 0 || rowTo >= matrix.Rows || rowTo >= rowIndexes.Length)
{
throw new ArgumentException();
}
if (column < 0 || column >= matrix.Columns)
{
throw new ArgumentException();
}
if (splitFrom < 0 || splitTo >= splitters.Length)
{
throw new ArgumentException();
}
if (splitIndexes.Length < splitters.Length)
{
throw new ArgumentException();
}
// this one knows how to swap two row indexes (a,b)
int[] g = rowIndexes;
Swapper swapper = new Swapper((b, c) =>
{
int tmp = g[b]; g[b] = g[c]; g[c] = tmp;
});
// compare splitter[a] with columnView[rowIndexes[b]]
DoubleMatrix1D columnView = matrix.ViewColumn(column);
IntComparator comp = new IntComparator((a, b) =>
{
double av = splitters[a];
double bv = columnView[g[b]];
return(av < bv ? -1 : (av == bv ? 0 : 1));
});
// compare columnView[rowIndexes[a]] with columnView[rowIndexes[b]]
IntComparator comp2 = new IntComparator((a, b) =>
{
double av = columnView[g[a]];
double bv = columnView[g[b]];
return(av < bv ? -1 : (av == bv ? 0 : 1));
});
// compare splitter[a] with splitter[b]
IntComparator comp3 = new IntComparator((a, b) =>
{
double av = splitters[a];
double bv = splitters[b];
return(av < bv ? -1 : (av == bv ? 0 : 1));
});
// generic partitioning does the main work of reordering row indexes
Cern.Colt.Partitioning.GenericPartition(rowFrom, rowTo, splitFrom, splitTo, splitIndexes, comp, comp2, comp3, swapper);
}
/// <summary>
/// Returns a string <i>s</i> such that <i>Object[] m = s</i> is a legal C# statement.
/// </summary>
/// <param name="matrix">the matrix to format.</param>
/// <returns></returns>
public String ToSourceCode(DoubleMatrix1D matrix)
{
Formatter copy = (Formatter)this.Clone();
copy.SetPrintShape(false);
copy.SetColumnSeparator(", ");
String lead = "{";
String trail = "};";
return(lead + copy.ToString(matrix) + trail);
}
public void Dtrmv(Boolean isUpperTriangular, Boolean transposeA, Boolean isUnitTriangular, DoubleMatrix2D A, DoubleMatrix1D x)
{
if (transposeA)
{
A = A.ViewDice();
isUpperTriangular = !isUpperTriangular;
}
Property.DEFAULT.CheckSquare(A);
int size = A.Rows;
if (size != x.Size)
{
throw new ArgumentException(A.ToStringShort() + ", " + x.ToStringShort());
}
DoubleMatrix1D b = x.Like();
DoubleMatrix1D y = x.Like();
if (isUnitTriangular)
{
y.Assign(1);
}
else
{
for (int i = 0; i < size; i++)
{
y[i] = A[i, i];
}
}
for (int i = 0; i < size; i++)
{
double sum = 0;
if (!isUpperTriangular)
{
for (int j = 0; j < i; j++)
{
sum += A[i, j] * x[j];
}
sum += y[i] * x[i];
}
else
{
sum += y[i] * x[i];
for (int j = i + 1; j < size; j++)
{
sum += A[i, j] * x[j];
}
}
b[i] = sum;
}
x.Assign(b);
}
/// <summary>
/// Fills all cells of the given vectors into the given histogram.
/// </summary>
/// <param name="histo"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="z"></param>
/// <param name="weights"></param>
/// <returns><i>histo</i> (for convenience only).</returns>
/// <exception cref="ArgumentException">if <i>x.Count != y.Count || x.Count != z.Count || x.Count != weights.Count</i>.</exception>
public static Hep.Aida.IHistogram3D Histogram(Hep.Aida.IHistogram3D histo, DoubleMatrix1D x, DoubleMatrix1D y, DoubleMatrix1D z, DoubleMatrix1D weights)
{
if (x.Size != y.Size || x.Size != z.Size || x.Size != weights.Size)
{
throw new ArgumentException(Cern.LocalizedResources.Instance().Matrix_VectorsMustHaveSameSize);
}
for (int i = x.Size; --i >= 0;)
{
histo.Fill(x[i], y[i], z[i], weights[i]);
}
return(histo);
}
/// <summary>
/// Fills all cells of the given vectors into the given histogram.
/// </summary>
/// <param name="histo"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="z"></param>
/// <param name="weights"></param>
/// <returns><i>histo</i> (for convenience only).</returns>
/// <exception cref="ArgumentException">if <i>x.Count != y.Count || x.Count != z.Count || x.Count != weights.Count</i>.</exception>
public static Hep.Aida.IHistogram3D Histogram(Hep.Aida.IHistogram3D histo, DoubleMatrix1D x, DoubleMatrix1D y, DoubleMatrix1D z, DoubleMatrix1D weights)
{
if (x.Size != y.Size || x.Size != z.Size || x.Size != weights.Size)
{
throw new ArgumentException("vectors must have same size");
}
for (int i = x.Size; --i >= 0;)
{
histo.Fill(x[i], y[i], z[i], weights[i]);
}
return(histo);
}
public void TestMain()
{
DoubleMatrix1D x1 = DoubleFactory1D.Dense.Make(new double[] { 1.0, 2.0 });
DoubleMatrix1D x2 = DoubleFactory1D.Dense.Make(new double[] { 1.0, -2.0 });
DoubleMatrix1D x3 = DoubleFactory1D.Dense.Make(new double[] { -1.0, -2.0 });
DoubleMatrix1D x4 = DoubleFactory1D.Dense.Make(new double[] { 4.0, 5.0 });
Assert.AreEqual(2, Algebra.NormInfinity(x1));
Assert.AreEqual(2, Algebra.NormInfinity(x2));
Assert.AreEqual(2, Algebra.NormInfinity(x3));
Assert.AreEqual(5, Algebra.NormInfinity(x4));
}
/// <summary>
/// Sorts the vector into ascending order, according to the order induced by the specified comparator.
/// </summary>
/// <param name="vector">
/// The vector to be sorted.
/// </param>
/// <param name="c">
/// The comparator to determine the order.
/// </param>
/// <returns>
/// A new matrix view sorted as specified.
/// </returns>
public DoubleMatrix1D Sort(DoubleMatrix1D vector, DoubleComparator c)
{
var indexes = new int[vector.Size]; // row indexes to reorder instead of matrix itself
for (int i = indexes.Length; --i >= 0;)
{
indexes[i] = i;
}
RunSort(indexes, 0, indexes.Length, (a, b) => c(vector[a], vector[b]));
return(vector.ViewSelection(indexes));
}
/// <summary>
/// 3-d OLAP cube operator; Fills all cells of the given vectors into the given histogram.
/// If you use Hep.Aida.Ref.Converter.ToString(histo) on the result, the OLAP cube of x-"column" vsd y-"column" vsd z-"column", summing the weights "column" will be printed.
/// For example, aggregate sales by product by region by time.
/// <p>
/// Computes the distinct values of x and y and z, yielding histogram axes that capture one distinct value per bin.
/// Then fills the histogram.
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="z"></param>
/// <param name="weights"></param>
/// <returns>the histogram containing the cube.</returns>
/// <excption cref="ArgumentException">if <i>x.Count != y.Count || x.Count != z.Count || x.Count != weights.Count</i>.</excption>
public static Hep.Aida.IHistogram3D cube(DoubleMatrix1D x, DoubleMatrix1D y, DoubleMatrix1D z, DoubleMatrix1D weights)
{
if (x.Size != y.Size || x.Size != z.Size || x.Size != weights.Size)
{
throw new ArgumentException("vectors must have same size");
}
var epsilon = 1.0E-9;
var distinct = new DoubleArrayList();
var vals = new double[x.Size];
var sorted = new DoubleArrayList(vals);
// compute distinct values of x
vals = x.ToArray(); // copy x into vals
sorted.Sort();
Cern.Jet.Stat.Descriptive.Frequencies(sorted, distinct, null);
// since bins are right-open [from,to) we need an additional dummy bin so that the last distinct value does not fall into the overflow bin
if (distinct.Count > 0)
{
distinct.Add(distinct[distinct.Count - 1] + epsilon);
}
distinct.TrimToSize();
Hep.Aida.IAxis xaxis = new Hep.Aida.Ref.VariableAxis(distinct.ToArray());
// compute distinct values of y
vals = y.ToArray();
sorted.Sort();
Cern.Jet.Stat.Descriptive.Frequencies(sorted, distinct, null);
// since bins are right-open [from,to) we need an additional dummy bin so that the last distinct value does not fall into the overflow bin
if (distinct.Count > 0)
{
distinct.Add(distinct[distinct.Count - 1] + epsilon);
}
distinct.TrimToSize();
Hep.Aida.IAxis yaxis = new Hep.Aida.Ref.VariableAxis(distinct.ToArray());
// compute distinct values of z
vals = z.ToArray();
sorted.Sort();
Cern.Jet.Stat.Descriptive.Frequencies(sorted, distinct, null);
// since bins are right-open [from,to) we need an additional dummy bin so that the last distinct value does not fall into the overflow bin
if (distinct.Count > 0)
{
distinct.Add(distinct[distinct.Count - 1] + epsilon);
}
distinct.TrimToSize();
Hep.Aida.IAxis zaxis = new Hep.Aida.Ref.VariableAxis(distinct.ToArray());
Hep.Aida.IHistogram3D histo = new Hep.Aida.Ref.Histogram3D("Cube", xaxis, yaxis, zaxis);
return(Histogram(histo, x, y, z, weights));
}
/// <summary>
/// Constructs and returns a new Cholesky decomposition object for a symmetric and positive definite matrix;
/// The decomposed matrices can be retrieved via instance methods of the returned decomposition object.
///
/// Return a structure to access <i>L</i> and <i>isSymmetricPositiveDefinite</i> flag.
/// </summary>
/// <param name="A">Square, symmetric matrix.</param>
/// <exception cref="ArgumentException">if <i>A</i> is not square.</exception>
public CholeskyDecomposition(DoubleMatrix2D A)
{
Property.DEFAULT.CheckSquare(A);
// Initialize.
//double[][] A = Arg.getArray();
n = A.Rows;
//L = new double[n][n];
mL = A.Like(n, n);
isSymmetricPositiveDefinite = (A.Columns == n);
//precompute and cache some views to avoid regenerating them time and again
DoubleMatrix1D[] Lrows = new DoubleMatrix1D[n];
for (int j = 0; j < n; j++)
{
Lrows[j] = mL.ViewRow(j);
}
// Main loop.
for (int j = 0; j < n; j++)
{
//double[] Lrowj = L[j];
//DoubleMatrix1D Lrowj = L.ViewRow(j);
double d = 0.0;
for (int k = 0; k < j; k++)
{
//double[] Lrowk = L[k];
double s = Lrows[k].ZDotProduct(Lrows[j], 0, k);
/*
* DoubleMatrix1D Lrowk = L.ViewRow(k);
* double s = 0.0;
* for (int i = 0; i < k; i++) {
* s += Lrowk.getQuick(i)*Lrowj.getQuick(i);
* }
*/
s = (A[j, k] - s) / mL[k, k];
Lrows[j][k] = s;
d = d + s * s;
isSymmetricPositiveDefinite = isSymmetricPositiveDefinite && (A[k, j] == A[j, k]);
}
d = A[j, j] - d;
isSymmetricPositiveDefinite = isSymmetricPositiveDefinite && (d > 0.0);
mL[j, j] = System.Math.Sqrt(System.Math.Max(d, 0.0));
for (int k = j + 1; k < n; k++)
{
mL[j, k] = 0.0;
}
}
}
/// <summary>
/// Returns <tt>true</tt> if both matrices share at least one identical cell.
/// </summary>
/// <param name="other">
/// The other matrix.
/// </param>
/// <returns>
/// <tt>true</tt> if both matrices share at least one identical cell.
/// </returns>
protected override bool HaveSharedCellsRaw(DoubleMatrix1D other)
{
if (other is SelectedDenseDoubleMatrix1D)
{
var otherMatrix = (SelectedDenseDoubleMatrix1D)other;
return(this.Elements == otherMatrix.Elements);
}
if (other is DenseDoubleMatrix1D)
{
var otherMatrix = (DenseDoubleMatrix1D)other;
return(this.Elements == otherMatrix.Elements);
}
return(false);
}
/// <summary>
/// Same as <see cref="partition(int[], int, int)"/>
/// except that it <i>synchronously</i> partitions the rows of the given matrix by the values of the given matrix column;
/// This is essentially the same as partitioning a list of composite objects by some instance variable;
/// In other words, two entire rows of the matrix are swapped, whenever two column values indicate so.
/// <p>
/// Let's say, a "row" is an "object" (tuple, d-dimensional point).
/// A "column" is the list of "object" values of a given variable (field, dimension).
/// A "matrix" is a list of "objects" (tuples, points).
/// <p>
/// Now, rows (objects, tuples) are partially sorted according to their values in one given variable (dimension).
/// Two entire rows of the matrix are swapped, whenever two column values indicate so.
/// <p>
/// Of course, the column must not be a column of a different matrix.
/// More formally, there must hold: <br>
/// There exists an <i>i</i> such that <i>matrix.ViewColumn(i)==column</i>.
///
/// Note that arguments are not checked for validity.
/// </summary>
/// <param name="matrix"></param>
/// <param name="column"></param>
/// <param name="from"></param>
/// <param name="to"></param>
/// <param name="splitter"></param>
/// <returns></returns>
private static int xPartitionOld(DoubleMatrix2D matrix, DoubleMatrix1D column, int from, int to, double splitter)
{
/*
* double element; // int, double --> template type dependent
* for (int i=from-1; ++i<=to; ) {
* element = column.getQuick(i);
* if (element < splitter) {
* // swap x[i] with x[from]
* matrix.swapRows(i,from);
* from++;
* }
* }
* return from-1;
*/
return(0);
}
