Comments (4)
I fixed it. Now the output looks correct:
Control:
[[-1 0 0]
[ 0 0 0]
[ 0 0 0]]
Test:
[[-1 0 0]
[ 0 0 0]
[ 0 0 0]]
Test flipped on axis 0:
[[ 0 0 0]
[ 0 0 0]
[-1 0 0]]
Control extracted back to C#:
-1 0 0 0 0 0 0 0 0
Test extracted back to C#:
0 0 0 0 0 0 -1 0 0
It was due to the flipped array's data layout not being contiguous. In such cases GetData now calls np.ascontiguous
internally and gives back the data of the contiguous copy.
from numpy.net.
This is very interesting. Could you give me a short piece of code which I can fashion into a unit test to reproduce and fix it?
from numpy.net.
Here you go!
`using System;
using Numpy;
namespace Test
{
class Program
{
static void Main(string[] args)
{
NumpyGlitch();
}
static void NumpyGlitch()
{
int[,] X = new int[3, 3];
X[0, 0] = -1;
NDarray npX = np.array(X, dtype: np.int32); // control
NDarray npY = np.array(X, dtype: np.int32); // test
Console.WriteLine("Control:");
Console.WriteLine(npX);
Console.WriteLine("Test:");
Console.WriteLine(npY);
// flip on the row axis
npY = np.flip(npY, new int[] { 0 });
Console.WriteLine("Test flipped on axis 0:");
Console.WriteLine(npY);
// get their data
int[] cX = npX.GetData<int>();
int[] cY = npY.GetData<int>();
Console.WriteLine("Control extracted back to C#:");
PrintArray(cX); // control is fine
Console.WriteLine("Test extracted back to C#:");
PrintArray(cY); // this one has some funny business going on!
}
static void PrintArray(int[] array)
{
for (int i = 0; i < array.Length; i++)
{
Console.Write("{0} ", array[i]);
}
Console.WriteLine();
}
}
}`
Thanks!
from numpy.net.
Great, thanks!
from numpy.net.
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from numpy.net.