Originally posted by: yhlvqz

　I have changed the lpex1.c to mexfile called lpex1_mex.c

but when I used matlab call lpex1_mex.c

mex -I/path/cplex/include/ilcplex -L/path/lib/x86-64-sles10_4.1/static_pic lpex1_mex.c

it showed mex: link of ' "lp_cplex_mex.mexa64"' failed.

if I changed to

mex -I/path/cplex/include/ilcplex -L/path/lib/x86-64-sles10_4.1/static_pic -lcplex lpex1_mex.c
It showed /usr/lib64/gcc/x86_64-suse-linux/4.3/../../../../x86_64-suse-linux/bin/ld: cannot find -lcplex
collect2: ld returned 1 exit status

mex: link of ' "lp_cplex_mex.mexa64"' failed.
I used linux system. I think I may miss something in mex. I appreciate if someone gives me some hint. Thanks
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Originally posted by: yhlvqz

I forgot to add .c to matlab path.
After I add path, it works.
:-)
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Originally posted by: John Cui

Good, but we provided matlab interface for matlab users, say cplexmilp, cplexlp, cplexqcp, etc. and Cplex class in MATLAB.

Then why do you want to build by yourself? Or you don't know we have matlab interface already?
John Cui
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Originally posted by: yhlvqz

hi, John

I need change different constrains for cplex and I want to use multi-core to run for-loop in c programming instead in matlab. Because matlab only allows to use maximum 8 cores.

I can use matlab mex to transfer data with c. But when I run cplex programming from matlab, it showed error I mentioned before. I think I may miss some parameter I should add when I complied c using mex. Would you help me solve this problem? Thanks a lot!
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Originally posted by: John Cui

To fix your complile issue, you should link cplex lib into your build script.

Do you mean in MATLAB, CPLEX only can use 8 cores to solve your problem?
John Cui
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Originally posted by: yhlvqz

hi, John

How I build lib cplex script in matlab? I have added -L/path/cplex/lib

I have additional for-loop in my code which can only use maximum 8 cores in matlab.
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Originally posted by: John Cui

Anyway, does your build script looks like this:

mex -O -I"<CPLEXDIR>/include" "your_cplex_mex.c" -L"<CPLEXLIBDIR>/lib" -lcplex124 -lut -largeArrayDims

John Cui
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Originally posted by: yhlvqz

hi, John

I tried your commend, but it still showed 'It showed /usr/lib64/gcc/x86_64-suse-linux/4.3/../../../../x86_64-suse-linux/bin/ld: cannot find -lcplex
collect2: ld returned 1 exit status'

I cannot find -lcplex or -lcplex124. Would you tell me where it should be? Thanks
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Originally posted by: John Cui

Did cplex bin folder is in your path?

John Cui
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Originally posted by: yhlvqz

hi, John

cplex/bin is in the matlab path.

there are four things in ILOG/cplex/bin/x86-64_sles10_4.1 including convert, cplex, cplexamp and libcplex123.so
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Originally posted by: John Cui

Then please try -lcplex123 in the build script.

John Cui
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Originally posted by: yhlvqz

I still have the problem for,

data.o: In function `mexFunction':
data.c:(.text+0xc4): undefined reference to `CPXopenCPLEX'
data.c:(.text+0x104): undefined reference to `CPXgeterrorstring'
data.c:(.text+0x127): undefined reference to `CPXsetintparam'
data.c:(.text+0x164): undefined reference to `CPXcreateprob'
data.c:(.text+0x208): undefined reference to `CPXcopylp'
data.c:(.text+0x241): undefined reference to `CPXlpopt'
data.c:(.text+0x29d): undefined reference to `CPXsolution'
data.c:(.text+0x2b9): undefined reference to `mxCreatDoubleMatrix'
data.c:(.text+0x2df): undefined reference to `CPXfreeprob'
data.c:(.text+0x313): undefined reference to `CPXcloseCPLEX'
data.c:(.text+0x351): undefined reference to `CPXgeterrorstring'
collect2: ld returned 1 exit status
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Originally posted by: yhlvqz

I still have the problem for,

data.o: In function `mexFunction':
data.c:(.text+0xc4): undefined reference to `CPXopenCPLEX'
data.c:(.text+0x104): undefined reference to `CPXgeterrorstring'
data.c:(.text+0x127): undefined reference to `CPXsetintparam'
data.c:(.text+0x164): undefined reference to `CPXcreateprob'
data.c:(.text+0x208): undefined reference to `CPXcopylp'
data.c:(.text+0x241): undefined reference to `CPXlpopt'
data.c:(.text+0x29d): undefined reference to `CPXsolution'
data.c:(.text+0x2b9): undefined reference to `mxCreatDoubleMatrix'
data.c:(.text+0x2df): undefined reference to `CPXfreeprob'
data.c:(.text+0x313): undefined reference to `CPXcloseCPLEX'
data.c:(.text+0x351): undefined reference to `CPXgeterrorstring'
collect2: ld returned 1 exit status
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