public NDArray Cast(NDArray nd, NPTypeCode dtype, bool copy)
{
if (dtype == NPTypeCode.Empty)
{
throw new ArgumentNullException(nameof(dtype));
}
NDArray clone()
{
var copied = new NDArray(nd.dtype, nd.TensorEngine);
copied.Storage.Allocate(ArrayConvert.To(nd.Array, dtype), nd.shape);
return(copied);
}
if (nd.GetTypeCode == dtype)
{
//casting not needed
return(copy ? clone() : nd);
}
else
{
//casting needed
if (copy)
{
return(clone());
}
//just re-set the data, conversion is handled inside.
nd.Storage.ReplaceData(nd.Storage.GetData(), dtype);
return(nd);
}
}
public static NDArray array(Array array, Type dtype = null, int ndmin = 1, bool copy = true, char order = 'C')
{
var arrType = array.ResolveElementType();
//handle dim expansion and extract shape
Shape shape;
var dims = array.ResolveRank();
var missing = dims - ndmin;
if (missing < 0)
{
shape = Arrays.Concat(Enumerable.Repeat(1, Math.Abs(missing)).ToArray(), Shape.ExtractShape(array));
}
else
{
shape = Shape.ExtractShape(array);
}
//flatten
if (shape.NDim > 1)
{
array = Arrays.Flatten(array);
copy = false;
}
if (dtype != null && dtype != arrType)
{
array = ArrayConvert.To(array, dtype);
copy = false;
}
return(new NDArray(copy ? (Array)array.Clone() : array, shape, order));
}