/// <summary>
/// Create an enumerator suitable for constructing images (i.e. travels along the first dimension,
/// then the second). If not 2D, first element is null.
/// </summary>
/// <param name="enumerable"></param>
/// <returns></returns>
public static IEnumerable <double> ToImageEnumerator(IEnumerable <object> enumerable, out int xLength, out int yLength)
{
int[] dimensions = GeneralArray.GetDimensions(enumerable);
xLength = dimensions[0];
yLength = 0;
if (dimensions.Length > 2)
{
return(null);
}
// If this is a list of lists, then create enumerator, otherwise convert to a rectangular array first.
// This gives better performance if not indexable or if this is a Numpy array.
Type arrayType = enumerable.GetType();
if (dimensions.Length == 2 && arrayType.Name != "ndarray" && IsIListOfILists(enumerable))
{
List <int> dimensionList = new List <int>();
IList parent = enumerable as IList;
int minLength = int.MaxValue; int maxLength = int.MinValue;
int count = parent.FastCount();
for (int i = 0; i < count; ++i)
{
IList child = parent[i] as IList;
if (child == null)
{
minLength = 0;
}
else
{
minLength = Math.Min(minLength, child.Count);
maxLength = Math.Max(maxLength, child.Count);
}
}
yLength = maxLength;
if (minLength == 0)
{
return(null);
}
else
{
return(Jagged2DImageEnumerable(parent, minLength, maxLength));
}
}
else if (dimensions.Length == 1)
{
return(Enumerable1D(enumerable));
}
else
{
double[,] array = (double[, ])GeneralArray.ToDoubleArray(enumerable);
yLength = dimensions[1];
return(array.ArrayEnumerator(EnumerationOrder2D.ColumnMajor));
}
}
/// <summary>
/// Converts object to a
/// </summary>
/// <param name="generalArray"></param>
/// <returns></returns>
public unsafe static Array ToDoubleArray(object generalArray)
{
Type arrayType = generalArray.GetType();
Array managedArray = null;
#region ILArray
if (arrayType.Name == "ILArray`1")
{
dynamic dynamicArray = generalArray;
if ((dynamicArray.Dimensions.NumberOfDimensions == 1) ||
((dynamicArray.Dimensions.NumberOfDimensions == 2) && (dynamicArray.Dimensions[1] == 1)))
{
int n = dynamicArray.Dimensions[0];
managedArray = new double[n];
double[] managedArrayCast = managedArray as double[];
for (int i = 0; i < n; ++i)
{
managedArrayCast[i] = dynamicArray.GetValue(i);
}
return(managedArray);
}
else if (dynamicArray.Dimensions.NumberOfDimensions == 2)
{
int n1 = dynamicArray.Dimensions[0];
int n2 = dynamicArray.Dimensions[1];
managedArray = new double[n1, n2];
double[,] managedArrayCast = managedArray as double[, ];
for (int i = 0; i < n1; ++i)
{
for (int j = 0; j < n2; ++j)
{
managedArrayCast[i, j] = dynamicArray.GetValue(i, j);
}
}
return(managedArray);
}
throw new Exception("Array must be one or two dimensionsal.");
}
#endregion
else if (arrayType.Name == "ndarray")
{
managedArray = ManagedArrayFromNumpyArray(generalArray);
}
else
{
// not Array, ILArray or Numpy array
int[] dimensions = GeneralArray.GetDimensions(generalArray);
if (dimensions.Length > 2)
{
throw new Exception("More than two dimensions found.");
}
if (dimensions.Length == 1)
{
var enumerable = generalArray as IEnumerable <object>;
double[] tempArray = new double[enumerable.Count()];
int index = 0;
foreach (object item in enumerable)
{
tempArray[index] = Convert.ToDouble(item);
index++;
}
managedArray = tempArray;
}
else
{
var parent = generalArray as IEnumerable <object>;
int minLength = int.MaxValue; int maxLength = int.MinValue;
int count = parent.FastCount();
foreach (IEnumerable <object> child in parent)
{
if (child == null)
{
minLength = 0;
}
else
{
minLength = Math.Min(minLength, child.FastCount());
maxLength = Math.Max(maxLength, child.FastCount());
}
}
int i = 0;
double[,] tempArray = new double[count, maxLength];
foreach (IEnumerable <object> child in parent)
{
int j = 0;
foreach (object element in child)
{
tempArray[i, j] = Convert.ToDouble(element);
j++;
}
while (j < maxLength)
{
tempArray[i, j] = Double.NaN; ++j;
}
i++;
}
managedArray = tempArray;
}
}
return(managedArray);
}