Error using mex: undefined reference for user build package

Question

Economist_101 2019-7-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/471770-error-using-mex-undefined-reference-for-user-build-package

编辑： Jan 2019-7-17

I run into the the following issue when I try to compile a user-build mex function :

>> mex kalcvf.c
Building with 'gcc'.
Error using mex
/tmp/mex_40203179616654_15298/kalcvf.o: In function `kalcvf':
kalcvf.c:(.text+0x120): undefined reference to `dcopy_'
(...)

the folder includes several files, such as

dlyap.c
kalcvf.c
kalcvf.def
kalcvf.vcproj
kalcvf.vcxproj
kalcvf.filters
kalcvf.user
matlib.c
matlib.h

and in a parent directory

mex.ncb
mex.sdf
mex.sln

What additional steps do I need to take in order to compile the mex function?

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Jan 2019-7-17

编辑：Jan 2019-7-17

在 MATLAB Online 中打开

According to the documentation https://www.mathworks.com/help/matlab/matlab_external/calling-lapack-and-blas-functions-from-mex-files.html

mex -v -R2017b yourFcn.c -lmwblas

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Economist_101 2019-7-17

在 MATLAB Online 中打开

Perfect, this did the trick:

mex -v -R2018a kalcvf/kalcvf.c kalcvf/dlyap.c kalcvf/matlib.c -lmwblas -lmwlapack

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Answer 1

Jan 2019-7-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/471770-error-using-mex-undefined-reference-for-user-build-package#answer_383577

在 MATLAB Online 中打开

According to the documentation https://www.mathworks.com/help/matlab/matlab_external/calling-lapack-and-blas-functions-from-mex-files.html . E.g.:

mex -v -R2017b yourFcn.c -lmwblas

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Answer 2

James Tursa 2019-7-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/471770-error-using-mex-undefined-reference-for-user-build-package#answer_383469

Try looking in the MATLAB/R2019a/extern/lib folder for versions of these files appropriate for your system. They might have slightly different names than above, but should have lapack and blas as part of the names.