public static dynamic arange(object start, object stop, object step)
{
dynamic returnValue = null;
switch (start)
{
case int startCast:
{
int stopCast = (int)stop;
int stepCast = (int)step;
returnValue = new NumSharp.Core.NDArray().arange(stopCast, startCast, stepCast);
break;
}
case float startCast_:
{
int startCast = (int)start;
int stopCast = (int)stop;
int stepCast = (int)step;
returnValue = new NumSharp.Core.NDArray().arange(stopCast, startCast, stepCast);
break;
}
}
return(returnValue);
}
/// <summary>
/// Retrieve element
/// low performance, use generic Data<T> method for performance sensitive invoke
/// </summary>
/// <param name="select"></param>
/// <returns></returns>
public object this[params int[] select]
{
get
{
if (select.Length == Shape.NDim)
{
switch (values)
{
case double[] values:
return(values[Shape.GetIndexInShape(select)]);
case int[] values:
return(values[Shape.GetIndexInShape(select)]);
}
return(null);
}
else
{
int start = Shape.GetIndexInShape(select);
int length = Shape.DimOffset[select.Length - 1];
var nd = new NDArray(dtype);
switch (values)
{
case double[] values:
Span <double> double8 = GetData <double>();
nd.Storage.Set(double8.Slice(start, length).ToArray());
break;
case int[] values:
Span <int> int32 = GetData <int>();
nd.Storage.Set(int32.Slice(start, length).ToArray());
break;
}
int[] shape = new int[Shape.NDim - select.Length];
for (int i = select.Length; i < Shape.NDim; i++)
{
shape[i - select.Length] = Shape[i];
}
nd.Storage.Shape = new Shape(shape);
return(nd);
}
}
set
{
if (select.Length == Shape.NDim)
{
switch (values)
{
case double[] values:
values[Shape.GetIndexInShape(select)] = (double)value;
break;
case int[] values:
values[Shape.GetIndexInShape(select)] = (int)value;
break;
}
}
else
{
int start = Shape.GetIndexInShape(select);
int length = Shape.DimOffset[Shape.NDim - 1];
switch (value)
{
case double v:
Span <double> data1 = GetData <double>();
var elements1 = data1.Slice(start, length);
for (int i = 0; i < elements1.Length; i++)
{
elements1[i] = v;
}
break;
case int v:
Span <int> data2 = GetData <int>();
var elements2 = data2.Slice(start, length);
for (int i = 0; i < elements2.Length; i++)
{
elements2[i] = v;
}
break;
}
}
}
}
/// <summary>
/// Return a new float array of given shape, filled with zeros.
/// </summary>
/// <param name="np"></param>
/// <param name="shape"></param>
/// <returns></returns>
public NDArray zeros(params int[] shape)
{
var nd = new NDArray(float64, new Shape(shape));
return(nd);
}
public NDArray power(ValueType exponent)
{
var powerArray = new NDArray(this.dtype, this.shape);
Array dataSysArr = this.Storage.GetData();
Array powerDataSysArr = powerArray.Storage.GetData();
switch (dataSysArr)
{
case double[] data:
{
var powerData = powerDataSysArr as double[];
for (int idx = 0; idx < data.Length; idx++)
{
powerData[idx] = Math.Pow(data[idx], (double)exponent);
}
break;
}
case float[] data:
{
var powerData = powerDataSysArr as float[];
for (int idx = 0; idx < data.Length; idx++)
{
powerData[idx] = (float)Math.Pow((double)data[idx], (double)exponent);
}
break;
}
case Complex[] data:
{
var powerData = powerDataSysArr as Complex[];
for (int idx = 0; idx < data.Length; idx++)
{
powerData[idx] = Complex.Pow(data[idx], (double)exponent);
}
break;
}
case int[] data:
{
var powerData = powerDataSysArr as int[];
for (int idx = 0; idx < data.Length; idx++)
{
powerData[idx] = (int)Math.Pow((double)data[idx], (double)exponent);
}
break;
}
default:
{
throw new IncorrectTypeException();
}
}
return(powerArray);
}