most functions in lapack.h is empty

[Yvonne-Ng]

Hi, I wonder if I am missing something but it seems like all the functions in lapack is empty and CMatrix relies on these functions to work. Are these functions expected to be used? Thanks

[lawrennd]

These functions are just header files for libraries that are normally in fortran, C++ needs an understanding of how to call them and (if memory serves me right!) that's what lapack.h does.

[Yvonne-Ng]

Hi Thanks for the answer! will you have any pointers on where I can find those fortran functions? I am trying to reuse the package but need to compile it in Cmake for it to work with my file. All of those functions are registered as not defined :/

[lawrennd]

I haven’t compiled in a while! So I’m scraping my memory for some of this stuff. Apologies if any of it is inaccurate.

But some separate instructions are available here on the readme (https://github.com/SheffieldML/GPc) but they’re likely out of date for many systems.

You need a fortran compiler, e.g. g77 or on OSX I think it’s best to use use gfortran.

For some clues as to where these files should be, check some of the make includes, for example:

https://github.com/SheffieldML/GPc/blob/master/make.atlas

Is looking for an installation of the LAPACK files in /usr/local/atlas/lib

Which I presume is where ATLAS puts it if you install it (http://math-atlas.sourceforge.net/atlas_install/)

However, nowadays, many different softwares will install lapack for you (e.g. R, Matlab, Octave, Anaconda). And it might be that linking to their files gives you something that’s optimised for your system.