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C-MEX codes face problem "MATLAB has attempted to use more stack space than is available"
The memory for plhs[0], plhs[1], and plhs[2] should be coming off of the heap, not the stack. So those variables should not be c...

11 years ago | 1

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Answered
Can I make use of OpenMP in my MATLAB MEX-files?
You left out one *extremely* important detail. The API functions that use the MATLAB Memory Manager are *not* thread-safe! That ...

11 years ago | 6

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Adding compaq visual fortran to compiler list
Support for Compaq Visual Fortran was discontinued many years ago. At first they just dropped the setup files (one could still g...

11 years ago | 0

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Answered
Rounding Errors in Matlab
"Shouldn't I get the same rounding error at least?" No, you should not expect this in general. MATLAB uses BLAS library routi...

11 years ago | 0

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How to convert for loop statement to matrix operation?
Assuming the matrix sizes are compatible, using logical indexing: temp( input_img == 0 ) = 0;

11 years ago | 0

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Do the calculation with 100 Digits and higher
Native IEEE double calculations in MATLAB are limited to about 15 decimal digits. For more than that, you can use vpa with the S...

11 years ago | 0

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Datenum conversion problem?
First, is yy really a Julian day array, or is it a Day Of the Year (DOY) number array? There are quite a few websites etc out th...

11 years ago | 0

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how to creat periodic function
Mod the input x with 2*pi and then do your testing above to generate the output, making sure to cover all cases for x between 0 ...

11 years ago | 0

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Is it possible for matlab to clear a mex function even when mexIsLocked is true?
Can you use the inmem function to verify that the mex routine actually got cleared even though it was locked? Do you have any c...

11 years ago | 0

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Speed of Matrix-Multiplication (in Matlab, C, other PCs)
MATLAB uses a very fast and highly optimized BLAS library to do matrix multiplication. You are unlikely to find anything faster ...

11 years ago | 0

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Many small Eigenvalue Decompositions in parallel on GPU?
If you just need the eigenvalues, you might look at this FEX submission by Bruno Luong: http://www.mathworks.com/matlabcentra...

11 years ago | 1

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Writing a function to find prime numbers
The basic problem is that you are mixing character variables (with the single quotes ' ') with logical variables (without single...

11 years ago | 0

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C-MEX file: I want to return an empty array, does anyone know how?
This will return an empty 0x0 matrix: #include "mex.h" void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArr...

11 years ago | 0

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Answered
How to filter a variable by removing NaN on matlab
You can skip the loops and just do this vectorized one-liner instead: data(isnan(data)) = 0; % Set all NaN elements to 0 us...

11 years ago | 1

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Answered
Deleting rows in a matrix
"Matrix B includes values which represent row numbers of matrix A that should be deleted" Assuming this is exactly what you w...

11 years ago | 0

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Access value of Enumeration from C/C++ mex function
Old style obects (i.e., those using exclusively the @classname directory structure) were stored internally as structs, which mad...

11 years ago | 1

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What is the fastest way to perform x'Ay ?
I don't know that there is anything faster than what you have written. A matrix multiply followed by an inner product using BLAS...

11 years ago | 1

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Error: "MATLAB cannot run this file because c:\~~~ shadows it. delete shadowing file and try again"
There is a pecking order of files to run when several files of the same base name are visible (i.e. in the current directory or ...

11 years ago | 7

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Save/Load an Object Array
To get your original variables to show up with the names they had originally (instead of field names in a struct), just use load...

11 years ago | 0

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Homework Problem Week 5 Problem 1
Change this: else a > 2012 to this: else And change this: elseif a >= 1996 && a <= 1980 gen = X; to...

11 years ago | 1

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How to use one matrix to constrain another matrix of the same size?
If I understand your question correctly, then x = A < 0.01; % Logical indexing for those elements you want to keep B(~x)...

11 years ago | 1

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Answered
Search entire multi level cell array for matching string
Does this do what you want? mystring = whatever string you are trying to find MyCellArrays = [cellfun(@(x)x(:)',MyCellAr...

11 years ago | 0

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Answered
How to find a string within a matrix and output array index to variable
your_matrix = 1621 x 1 matrix containing values 1 - 4 site = some value 1 - 4 indexes = find( your_matrix == site );

11 years ago | 0

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How to load a variable from a loop name mat ?
Are you simply asking how to load a specific variable? E.g., variable_to_load = 'X'; for n=1:4 load(['nano',num2...

11 years ago | 0

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How to Combine Several Variables Into One Matrix?
The easiest way would be to read your variables into elements of a column vector cell array instead of reading them in as indivi...

11 years ago | 0

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How can I fix the error when multiple two matrices?
Did you mean element-wise multiplication? If so, use the .* operator. E.g., a = your 100 x 1 vector b = your 100 x 1 vec...

11 years ago | 0

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?? Error using ==> times Matrix dimensions must agree.
Type the following at the command line: dbstop if error Then run your code. It will pause at the line with the error. Ex...

11 years ago | 0

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How to properly write an if-else-statement such that if the condition is met, then the values in x-vector will be stored in the vector; or else the values in the x-vector will not be deleted??
g = (x >= 1) & (x <= 2440); % Logical result of the elements you want to keep x(~g) = []; % Delete the others (or you could...

11 years ago | 1

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Answered
Random number gerator problem
hist(r, 1:limit); You inadvertently used randomness in your hist call, so MATLAB tried a recursive call with no arguments, ...

11 years ago | 0

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How can a MEX file give parameters to a C++ program?
In this line you are using an integer output format %i to print a floating point double value: mexPrintf("Value Read = %i\n...

11 years ago | 1

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