Hello,
I try to use the dll example copyAtoB using matrix 10 * 10:
//load the shared library into GAUSS
dlibrary ECOS;
//size of vectors
nelems = 10;
//Fill in 'A' with random normal numbers
A = rndn(nelems, 10);
//Pre-allocate 'B' to be the same size as 'A'
B = zeros(nelems, 10);
//Call your C function
dllcall copyAtoB(A, B, nelems);
How can I modify the c funtion to have the expected results? I tried double pointer but without sucess.
thanks
3 Answers
0
Assuming you used the C code from the accepted answer in this post, based on your GAUSS code above, I would expect that when B comes back from the dllcall it contains the first 10 numbers from A and the rest zeros.
In C you operate on an element at a time, so the nelems input to copyAtoB needs to be equal to the total number of elements in each matrix. For example, this should work:
//load the shared library into GAUSS dlibrary ECOS; //size of vectors nrows = 10; ncols = 10; total_elems = nrows * ncols; //Fill in 'A' with random normal numbers A = rndn(nrows, ncols); //Pre-allocate 'B' to be the same size as 'A' B = zeros(nrows, ncols); //Call your C function dllcall copyAtoB(A, B, total_elems);
Your Answer
3 Answers
Assuming you used the C code from the accepted answer in this post, based on your GAUSS code above, I would expect that when B comes back from the dllcall it contains the first 10 numbers from A and the rest zeros.
In C you operate on an element at a time, so the nelems input to copyAtoB needs to be equal to the total number of elements in each matrix. For example, this should work:
//load the shared library into GAUSS dlibrary ECOS; //size of vectors nrows = 10; ncols = 10; total_elems = nrows * ncols; //Fill in 'A' with random normal numbers A = rndn(nrows, ncols); //Pre-allocate 'B' to be the same size as 'A' B = zeros(nrows, ncols); //Call your C function dllcall copyAtoB(A, B, total_elems);