blockIdy.y and threadIdy.y says undefined

Accelerated Computing CUDA CUDA Programming and Performance
1

Hello,

I am trying to add two dimensional array in cuda c++
my global function looks like this

global void addMatrix(int *d_array1, int *d_array2, int d_result)
{
int j= blockIdx.xblockDim.x + threadIdx.x;

int i= blockIdy.y*blockDim.y + threadIdy.y;

// rest of the function

}

but while compiling, an error shows which says blockIdy.y and threadIdy.y are undefined.

Please let me know how can I fix this.

Thanks

2

The correct syntax is not:

blockIdy.y

it should be

blockIdx.y

likewise for threadIdy.y

They are indeed undefined. You are using incorrect syntax.

3

the Idx in blockIdx is an abbreviation for Index.

You used Idy instead… Indey is not a word. ;)