//---------------------------------------------------------------------------------------------
/// <summary>
/// Clamp length (modulus) of the elements in the complex array
/// </summary>
/// <param name="array"></param>
/// <param name="fMinimum"></param>
/// <param name="fMaximum"></param>
static public void ClampLength(ComplexD[] array, double fMinimum, double fMaximum)
{
for (int i = 0; i < array.Length; i++)
{
array[i] = ComplexD.FromModulusArgument(Math.Max(fMinimum, Math.Min(fMaximum, array[i].GetModulus())), array[i].GetArgument());
}
}
//---------------------------------------------------------------------------------------------------
/// <summary>
/// Swap two complex numbers
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
static public void Swap(ref ComplexD a, ref ComplexD b)
{
ComplexD temp = a;
a = b;
b = temp;
}
/// <summary>
/// Clamp elements in the complex array to range [minimum,maximum]
/// </summary>
/// <param name="array"></param>
/// <param name="minimum"></param>
/// <param name="maximum"></param>
static public void Clamp(ComplexD[] array, ComplexD minimum, ComplexD maximum)
{
for (int i = 0; i < array.Length; i++)
{
array[i].Re = Math.Min(Math.Max(array[i].Re, minimum.Re), maximum.Re);
array[i].Im = Math.Min(Math.Max(array[i].Re, minimum.Im), maximum.Im);
}
}
/// <summary>
/// Add a specific value to each element in the array
/// </summary>
/// <param name="array"></param>
/// <param name="offset"></param>
static public void Offset(ComplexD[] array, ComplexD offset)
{
int length = array.Length;
for (int i = 0; i < length; i++)
{
array[i] += offset;
}
}
/// <summary>
/// Is this complex number equivalent to another object?
/// </summary>
/// <param name="o"></param>
/// <returns></returns>
public override bool Equals(object o)
{
if (o is ComplexD || o is double)
{
ComplexD c = (ComplexD)o;
return(this == c);
}
return(false);
}
/// <summary>
/// Creates a complex array from an array of doubles
/// </summary>
/// <param name="RealArray">Real parts, the imaginary parts presumed zero</param>
/// <returns></returns>
static public ComplexD[] CreateFromReal(double[] RealArray)
{
Debug.Assert(RealArray != null);
Debug.Assert(RealArray.Length >= 0);
ComplexD[] tmp = new ComplexD[RealArray.Length];
for (int i = 0; i < tmp.Length; i++)
{
tmp[i].Re = (double)RealArray[i];
}
return(tmp);
}
/// <summary>
/// Multiply each element in the array by a specific value
/// </summary>
/// <param name="array"></param>
/// <param name="scale"></param>
static public void Scale(ComplexD[] array, ComplexD scale)
{
Debug.Assert(array != null);
int length = array.Length;
for (int i = 0; i < length; i++)
{
array[i] *= scale;
}
}
/// <summary>
/// Multiply each element in the array by a specific value
/// </summary>
/// <param name="array"></param>
/// <param name="scale"></param>
/// <param name="start"></param>
/// <param name="length"></param>
static public void Scale(ComplexD[] array, ComplexD scale, int start, int length)
{
Debug.Assert(array != null);
Debug.Assert(start >= 0);
Debug.Assert(length >= 0);
Debug.Assert((start + length) < array.Length);
for (int i = 0; i < length; i++)
{
array[i + start] *= scale;
}
}
/// <summary>
/// Calculate the square root of a complex number
/// </summary>
/// <param name="c"></param>
/// <returns></returns>
static public ComplexD Sqrt(ComplexD c)
{
double x = c.Re;
double y = c.Im;
double modulus = Math.Sqrt(x * x + y * y);
int sign = (y < 0) ? -1 : 1;
c.Re = (double)(_halfOfRoot2 * Math.Sqrt(modulus + x));
c.Im = (double)(_halfOfRoot2 * sign * Math.Sqrt(modulus - x));
return(c);
}
/// <summary>
/// Calculate the power of a complex number
/// </summary>
/// <param name="c"></param>
/// <param name="exponent"></param>
/// <returns></returns>
static public ComplexD Pow(ComplexD c, double exponent)
{
double x = c.Re;
double y = c.Im;
double modulus = Math.Pow(x * x + y * y, exponent * 0.5);
double argument = Math.Atan2(y, x) * exponent;
c.Re = (double)(modulus * System.Math.Cos(argument));
c.Im = (double)(modulus * System.Math.Sin(argument));
return(c);
}
// // <summary>
// // Conver the complex array to a double array
// // </summary>
// // <param name="array"></param>
// // <param name="style"></param>
// // <returns></returns>
/* static public double[] ConvertToDoubleArray( ComplexD[] array, ConversionStyle style ) {
* double[] newArray = new double[ array.Length ];
* switch( style ) {
* case ConversionStyle.Length:
* for( int i = 0; i < array.Length; i ++ ) {
* newArray[i] = (double) array[i].GetModulus();
* }
* break;
* case ConversionStyle.Real:
* for( int i = 0; i < array.Length; i ++ ) {
* newArray[i] = (double) array[i].Re;
* }
* break;
* case ConversionStyle.Imaginary:
* for( int i = 0; i < array.Length; i ++ ) {
* newArray[i] = (double) array[i].Im;
* }
* break;
* default:
* Debug.Assert( false );
* break;
* }
* return newArray;
* } */
//---------------------------------------------------------------------------------------------
/// <summary>
/// Determine whether the elements in the two arrays are the same
/// </summary>
/// <param name="array1"></param>
/// <param name="array2"></param>
/// <param name="tolerance"></param>
/// <returns></returns>
static public bool IsEqual(ComplexD[] array1, ComplexD[] array2, double tolerance)
{
if (array1.Length != array2.Length)
{
return(false);
}
for (int i = 0; i < array1.Length; i++)
{
if (ComplexD.IsEqual(array1[i], array2[i], tolerance) == false)
{
return(false);
}
}
return(true);
}
/// <summary>
/// Parse a complex representation in this fashion: "( %f, %f )"
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
static public ComplexD Parse(string s)
{
char[] sep = { '(', ',', 'i', ' ' };
string[] ss = s.Split(sep, StringSplitOptions.RemoveEmptyEntries);
ComplexD c = FromReal(0.0);
if (ss.Length >= 1)
{
c.Re = Convert.ToDouble(ss[0]);
}
if (ss.Length >= 2)
{
c.Im = Convert.ToDouble(ss[1]);
}
return(c);
}
static private ComplexD SumRecursion( ComplexD[] data, int start, int end ) {
Debug.Assert( 0 <= start, "start = " + start );
Debug.Assert( start < end, "start = " + start + " and end = " + end );
Debug.Assert( end <= data.Length, "end = " + end + " and data.Length = " + data.Length );
if( ( end - start ) <= 1000 ) {
ComplexD sum = ComplexD.Zero;
for( int i = start; i < end; i ++ ) {
sum += data[ i ];
}
return sum;
}
else {
int middle = ( start + end ) >> 1;
return SumRecursion( data, start, middle ) + SumRecursion( data, middle, end );
}
}
static private double SumOfSquaredErrorRecursion( ComplexD[] alpha, ComplexD[] beta, int start, int end ) {
Debug.Assert( 0 <= start, "start = " + start );
Debug.Assert( start < end, "start = " + start + " and end = " + end );
Debug.Assert( end <= alpha.Length, "end = " + end + " and alpha.Length = " + alpha.Length );
Debug.Assert( beta.Length == alpha.Length );
if( ( end - start ) <= 1000 ) {
double sumOfSquaredError = 0;
for( int i = start; i < end; i ++ ) {
ComplexD delta = beta[ i ] - alpha[ i ];
sumOfSquaredError += ( delta.Re * delta.Re ) + ( delta.Im * delta.Im );
}
return sumOfSquaredError;
}
else {
int middle = ( start + end ) >> 1;
return SumOfSquaredErrorRecursion( alpha, beta, start, middle ) + SumOfSquaredErrorRecursion( alpha, beta, middle, end );
}
}
//---------------------------------------------------------------------------------------------
/// <summary>
/// Shift (offset) the elements in the array
/// </summary>
/// <param name="array"></param>
/// <param name="offset"></param>
static public void Shift(ComplexD[] array, int offset)
{
Debug.Assert(array != null);
Debug.Assert(offset >= 0);
Debug.Assert(offset < array.Length);
if (offset == 0)
{
return;
}
int length = array.Length;
ComplexD[] temp = new ComplexD[length];
for (int i = 0; i < length; i++)
{
temp[(i + offset) % length] = array[i];
}
for (int i = 0; i < length; i++)
{
array[i] = temp[i];
}
}
//-----------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------
/// <summary>
/// Determine whether two complex numbers are almost (i.e. within the tolerance) equivalent.
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <param name="tolerance"></param>
/// <returns></returns>
static public bool IsEqual(ComplexD a, ComplexD b, double tolerance)
{
return
((Math.Abs(a.Re - b.Re) < tolerance) &&
(Math.Abs(a.Im - b.Im) < tolerance));
}
/// <summary>
/// Create a complex number based on an existing complex number
/// </summary>
/// <param name="c"></param>
public ComplexD(ComplexD c)
{
this.Re = c.Re;
this.Im = c.Im;
}
