Error using mex command

I am trying to run this test file test_lfmm3dtria_direct.m from this 3D Boundary Element Method project https://github.com/mjcarley/bem3d/tree/master/fmmlib3d-1.2/matlab and i get the following error, even though there are some "fmm3d_r2012a.mexa64" , "fmm3d_r2012a.mexw32" files in the folder

Unrecognized function or variable 'fmm3d_r2012a'.

Error in lfmm3dtria (line 133)

[ier, pot, fld, pottarg, fldtarg] = fmm3d_r2012a(mex_id_, ier, iprec, nsource, triaflat, trianorm, source, ifcharge, charge, ifdipole, dipstr, dipvec,

ifpot, pot, iffld, fld, ntarget, target, ifpottarg, pottarg, iffldtarg, fldtarg, 1, 1, 1, 3, nsource, 3, nsource, 1, 1, 3, nsource, 1, 1, 1, 1, 1);

Error in test_lfmm3dtria_direct (line 77)

[U]=lfmm3dtria(iprec,ntri,triangles,trianorm,source,ifcharge,charge,ifdipole,dipstr,dipvec,ifpot,iffld,ntarget,target,ifpottarg,iffldtarg);

when i tried to rebuild them from the "fmm3d_r2012a.c" source file I got this.

mex fmm3d_r2012a.c

Building with 'MinGW64 Compiler (C)'.

Error using mex

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x25ae): undefined reference to `hfmm3dtriaself_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x3cea): undefined reference to `hfmm3dtriatarg_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x523e): undefined reference to `h3dtriadirect_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x601a): undefined reference to `lfmm3dtriaself_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x7593): undefined reference to `lfmm3dtriatarg_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x8688): undefined reference to `l3dtriadirect_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x9411): undefined reference to `hfmm3dpartself_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0xa963): undefined reference to `hfmm3dparttarg_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0xba0c): undefined reference to `h3dpartdirect_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0xc648): undefined reference to `lfmm3dpartself_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0xd9c4): undefined reference to `lfmm3dparttarg_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0xe84e): undefined reference to `l3dpartdirect_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0xf7ad): undefined reference to `d3tstrcr_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x10ed5): undefined reference to `d3tstrcrem_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x116dd): undefined reference to `d3tgetb_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x11c67): undefined reference to `d3tgetl_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x11f2a): undefined reference to `prini_'

C:\Users\kopor\AppData\Local\Temp\mex_5474549107164433_18812\fmm3d_r2012a.obj:fmm3d_r2012a.c:(.text+0x12f23): undefined reference to `hfmm3dtriampftarg_'

collect2.exe: error: ld returned 1 exit status

I am using matlab R2020b.

[Debadipto]

Hello @Raksi, the github link that you've provided seems to be broken. Could you please verify and fix the link?

Answer 1

[Narvik]

Hi,

I understand that you are facing an issue while trying to use the mex command. The error ‘collect2.exe: error: Id returned 1 exit status’ usually occurs when winsock library is missing.

Please follow the troubleshooting steps provided in the MATLAB answer below:

https://www.mathworks.com/matlabcentral/answers/1652320-collect2-exe-error-id-returned-1-exit-status-when-building-s-function

Hope this helps!