Why is mxCreateNumericMatrix maximum size smaller than system maximum array size?
2 views (last 30 days)
Show older comments
Hi,
I am trying to create a matrix in a MEX function. The following works:
uint64_t N;
N = 2147483647; // N = 2*2^30 -1
plhs[0] = mxCreateNumericMatrix(N,1,MXUINT8_CLASS,mxREAL);
However, I am unable to create an array that is this size:
uint64_t N;
N = 2147483648; // N = 2*2^30
plhs[0] = mxCreateNumericMatrix(N,1,MXUINT8_CLASS,mxREAL);
The preceding code throws the error:
maximum variable size allowed by the function exceeded
Which is confusing since my system (64-bit Linux running 64-bit Matlab 2010b) tells me the maximum array size is, in fact, very large.
[~,M] = computer
M =
281474976710655 % 2^48 -1 for those of you keeping track
Furthermore, from the command line, I am able to create very large arrays, and have been quite happily for some time, with calls like the following:
a = zeros(16*2^30,1,'uint8');
disp(uint64(numel(a)))
17179869184
My question is, why am I not able to create arrays in my mex function that I am clearly able to create from the command line, or from other *.m functions?
Thank you.
0 Comments
Accepted Answer
More Answers (0)
See Also
Categories
Find more on Write C Functions Callable from MATLAB (MEX Files) in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!