Loading Files into Codegen Files
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Is there any good way to load data from files (hopefully MAT-files) into a Matlab function that will be going through the Matlab coder? I've been looking into using a bunch of coder.eval calls into the C MAT-file library, but it looks like this process is going to be exceedingly painful and I'm not entirely sure it will let me return arrays anyway, since ceval can only return Scalars...
Any ideas?
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Carlos Pereira
2016-5-9
编辑:Carlos Pereira
2016-5-9
Dear friends,
I have a quite similar problem. Using MATLAB coder I want to convert a matlab function to mex file. Furthermore, on this function I called a matrix (2001x2 double) from a MAT file. I´m not getting a way to make it. With the "testReadMAT" I can´t call the matrix from .MAT in "X". I think you had the same problem and, if it´s possible, help me for fix it.
I´m looking forward for answers from any users!!!!
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Kaustubha Govind
2012-4-18
I think using coder.ceval is the right way to do this. Also, coder.ceval can return arrays/matrices. You just need to pre-allocate the return value so that it knows that type to expect. I haven't tried this before though, so please post back if you run into specific issues.
EDIT:
coder.ceval does indeed return only scalar values as mentioned in the documentation. I was able to generate code for this operation using this MATLAB code:
function X = testReadMAT()
%#codegen
if ~isempty(coder.target)
X = 0;
SS_Table_file = coder.opaque('MATFile *');
SS_Table_file = coder.ceval('matOpen','datatable.mat','r');
Xp = coder.opaque('mxArray *');
Xp = coder.ceval('matGetVariable',SS_Table_file,'X');
coder.ceval('matClose', SS_Table_file);
X = coder.ceval('mxGetPr',Xp);
end
end
>> codegen -c -config:exe testReadMAT.m
There is still work to be done to build the code against the MAT-file API however.
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Kaustubha Govind
2012-4-19
Greg: Sorry about my earlier answer! Yes, you are correct that coder.ceval only returns scalar values. It does indeed say so clearly in the documentation page for coder.ceval.
I was actually able to generate code using your second approach. I will edit my answer to provide the code.
更多回答(3 个)
Greg
2012-4-28
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Kaustubha Govind
2012-4-30
The location of mat.h is $matlabroot/extern/include/mat.h, so you need to make sure that "C:\Program Files\MATLAB\R2012\extern\include\mat.h" exists and add it using a #include statement. That is, under "Header File" add #include "mat.h" and under "Include Directories", add the path.
1 1
2013-11-25
Hi Kaustubha, can you please explain how i can use coder to return matrix, i tried to use your trick mentioned above without success. Thanks in advance. Avi
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Ryan Livingston
2013-11-26
The function coder.load is now supported which loads data from a MAT file at compile-time as constants:
The syntax is basically the same as LOAD in MATLAB.
Also, LOAD is now supported in MEX. Search for load here for more details:
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