Link mat.h in a C++ file

Question

I have to use mat.h for open a .mat file in my C++ code. My code is that:

#include "mat.h"
using namespace std;
int main() {
MATFile *pmat;
pmat = matOpen("ns3Da.mat","r");
return 0;
}

The command I use to compile is that:

g++ program.cpp -I/usr/local/MATLAB/R2012a/extern/include -L/usr/local/MATLAB/R2012a/bin/* -L/usr/local/MATLAB/R2012a/extern/lib -o program

The error I obtain is that:

/tmp/ccSWqTnb.o: In function 'main': programma_c.cpp:(.text+0x13): undefined reference to 'matOpen' collect2: error: ld returned 1 exit status

I use Linux Ubuntu 16.04 LTS and Matlab 2012a version.

How can I resolve this error?

You are not linking a required library. You only specify the library search paths. — nakiya, Jun 15 '17 at 09:57
OK, who thought that "mat.h" was a good name for a header? It looks like if someone had had misspelled "math.h" — Cubic, Jun 15 '17 at 10:06

dlmeetei · Answer 1 · 2017-06-15T12:29:58.523

1

The -L flag in compilation specifies the path to search for libraries. -l flag should be used to specify the name of library without lib, for instance, in your case -lmat. So your compilation command should be something like

g++ program.cpp -I/usr/local/MATLAB/R2012a/extern/include -L/usr/local/MATLAB/R2012a/bin/glnxa64 -L/usr/local/MATLAB/R2012a/extern/lib -lmat -o program

edited Jun 15 '17 at 12:29

answered Jun 15 '17 at 10:06

dlmeetei

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/usr/bin/ld: cannot find -lmat collect2: error: ld returned 1 exit status – Sara Savio Jun 15 '17 at 11:00
1

where is `libmat` located in your system – dlmeetei Jun 15 '17 at 11:58
In /usr/local/MATLAB/R2012a/bin/glnxa64 there is libmat.so – Sara Savio Jun 15 '17 at 12:08
I have updated the answer accordingly, Please give a trial – dlmeetei Jun 15 '17 at 12:30
/usr/bin/ld: warning: libmwfl.so, needed by /usr/local/MATLAB/R2012a/bin/glnxa64/libmat.so, not found (try using -rpath or -rpath-link) /usr/bin/ld: warning: libmwi18n.so, needed by /usr/local/MATLAB/R2012a/bin/glnxa64/libmat.so, not found (try using -rpath or -rpath-link) ...... collect2: error: ld returned 1 exit status – Sara Savio Jun 15 '17 at 12:37
where is `libmwfl.so` in ur system? – dlmeetei Jun 15 '17 at 12:39
Also `libmwi18n.so` – dlmeetei Jun 15 '17 at 12:45
In /usr/local/MATLAB/R2012a/bin/glnxa64 – Sara Savio Jun 15 '17 at 13:11
ur last but one comment says it is not available at /usr/local/MATLAB/R2012a/bin/glnxa64 – dlmeetei Jun 15 '17 at 13:52
You have an idea of how to make them available, I see them all in the / usr / local / MATLAB / R2012a / bin / glnxa64 folder – Sara Savio Jun 15 '17 at 15:31
@SaraSavio You got this done? I have the same issue in Windows. – Sndn Dec 22 '17 at 11:55

Link mat.h in a C++ file

1 Answers1

Linked