arrayfire / arrayfire-dotnet

.NET wrapper for ArrayFire
BSD 3-Clause "New" or "Revised" License
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Error in assignment to multidimensional arrays #27

Open Asiek777 opened 4 years ago

Asiek777 commented 4 years ago

There's a problem with [] (indexing) operator. Indexing with with one number can be used to read value from the entire table, but it cannot be used to write to multidimensional table. While indexing with 2 or more numbers you can write to any table. I am not sure, if it is the consequence of C implementation or problem with the wrapper, but this behavior is very unintuitive.

Checked on CPU and OpenCL Backend. I'll try to fix it on my own There's an example of the problem

    ArrayFire.Array A1D = Data.CreateArray(new int[] { 1, 2, 4 });
    A1D[1] = Data.CreateArray(new int[] { 100 });
    Util.Print(A1D, "A1");

    A2D[0, 0] = Data.CreateArray(new int[] { 11 });
    A2D[1] = Data.CreateArray(new int[] { 100 });
    Util.Print(A2D, "A");

   A3D[1,1,1] = Data.CreateArray(new int[] { 100 });
   A3D[0, 1] = Data.CreateArray(new int[] { 100 });
   A3D[0] = Data.CreateArray(new int[] { 100 });
   Util.Print(A3D[1,1], "A3D");

Generates the output

A1D
[3 1 1 1]
         1
       100
         4

A2D
[3 3 1 1]
       100         -1          4
         2          2          2
         4          0          3

A3D
[2 2 2 1]
         1        100
         2         -1

         2          4
         0        100
9prady9 commented 4 years ago

I wasn't not able to reproduce this in upstream. @royalstream @Oceania2018 Can one of you please verify if this is from the wrapper.