mxGetDimensions returning incorrect values
3 次查看(过去 30 天)
显示 更早的评论
I'm having a problem getting a mex file to run properly, and I was able to isolate the culprit as mxGetDimensions. For a matrix with dimensions MxNxL (in MATLAB), the function is returning the dimensions as Mx0xN. The relevant portion of the code follows. It's part of a code that will be run on the GPU but the problem occurs before I even do anything with the GPU.
#include "cuda.h"
#include "mex.h"
#include "math.h"
/*Main mex function*/
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
int L,N,M,dims,gridDim_y,i;
const int *dim_array;
double *vUoldr, *vUoldi, *vUnewr, *vUnewi;
float *fvUoldr, *fvUoldi;
/*GPU variables:*/
float *Uoldr_gpu, *Uoldi_gpu;
/*Find the dimensions of the input cube*/
dims = (int)mxGetNumberOfDimensions(prhs[0]);
dim_array = (const int*)mxGetDimensions(prhs[0]);
M = dim_array[0];
N = dim_array[1];
L = dim_array[2];
printf("%d %d %d %d\n",dims,M, N, L);
etc
}
In case something in my compilation is the issue here are the commands I'm using to compile:
!/usr/local/cuda/bin/nvcc -c -m64 -arch=sm_30 test.cu -Xcompiler -fPIC -I /Applications/MATLAB_R2011a.app/extern/include
mex -largeArrayDims test.o
and my MATLAB version is 2011a on Mac OS 10.7.4. Any ideas would be helpful as I'm sort of stumped at this point.
1 个评论
Jan
2012-9-21
编辑:Jan
2012-9-21
@Jake: You use a meaningful title, useful tags (I add some others), you have spent time to isolate the problem and describe it clearly. The question contains the required code, though it is not formatted perfectly (I mark the code and hit the "{} Code" button for the last piece of perfection). You show the compile command, which can be useful for Mex problems and finally you mention the Matlab an OS version. Thanks for asking a good question! +1
采纳的回答
Jan
2012-9-21
编辑:Jan
2012-9-22
This fails on 64 bit machines, which use 32 bit for type INT:
dims = (int)mxGetNumberOfDimensions(prhs[0]);
dim_array = (const int*) mxGetDimensions(prhs[0]);
Better and working under 32 and 64 bit:
const mwSize *dim_array, dims;
dims = mxGetNumberOfDimensions(prhs[0]);
dim_array = mxGetDimensions(prhs[0]); // No casting needed, thanks James
6 个评论
更多回答(1 个)
Malcolm Lidierth
2012-9-21
Is N correct? I am rusty with mex but with -largeArrayDims, mxGetDimensions returns size_t results. See MATLAB docs for mwSize
0 个评论
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Search Path 的更多信息
产品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!