What functions are included in the arpack-ng library?

[Jiangsese]

I'm a beginner, and the Fortran program provided by my teacher uses the ARPACK and LAPACK libraries. I have installed the ARPACK library and called it along with the MKL library, but I encountered the following errors:

zndrv1.obj : error LNK2019: unresolved external symbol ZNAUPD, referenced in function ZNAUPD.t871p.t872p.t873p.t874p.t875p.t876p.t877p.t878p.t879p.t880p.t881p.t882p.t883p.t884p.t885p.t886p.t887p.t3v.t3v

zndrv1.obj : error LNK2019: unresolved external symbol ZNEUPD, referenced in function ZNEUPD.t965p.t966p.t967p.t968p.t969p.t970p.t971p.t972p.t973p.t974p.t975p.t976p.t977p.t978p.t979p.t980p.t981p.t982p.t983p.t984p.t985p.t986p.t987p.t988p.t3v.t3v.t3v

eigenhh1.obj : error LNK2019: unresolved external symbol DSAUPD, referenced in function DSAUPD.t544p.t545p.t546p.t547p.t548p.t549p.t550p.t551p.t552p.t553p.t554p.t555p.t556p.t557p.t558p.t559p.t3v.t3v

eigenhh1.obj : error LNK2019: unresolved external symbol DSEUPD, referenced in function DSEUPD.t633p.t634p.t635p.t636p.t637p.t638p.t639p.t640p.t641p.t642p.t643p.t644p.t645p.t646p.t647p.t648p.t649p.t650p.t651p.t652p.t653p.t654p.t3v.t3v.t3v

eigenhh1.obj : error LNK2019: unresolved external symbol DMOUT, referenced in function DNRM2.void

Could you please confirm if these functions are not included in the ARPACK-NG library, or if there might be an issue with my installation? Thank you for your response.

[Jiangsese]

Additionally, even if I don't use MKL or don't link the ARPACK-NG library, the same errors occur.

[fghoussen]

Could you please confirm if these functions are not included in the ARPACK-NG library

All [SDCZ]S[AE]UPD methods are provided by arpack.
How they are designed is explained here:

arpack-ng/README.md

Line 365 in 4caa8f4

http://li.mit.edu/Archive/Activities/Archive/CourseWork/Ju_Li/MITCourses/18.335/Doc/ARPACK/Lehoucq97.pdf

MKL is tricky to use: start simple with regular BLAS/LAPACK first.

[Jiangsese]

However, I tried again. If only ARPACK-NG is called, the same errors still occur:

ssh.obj: error LNK2019: unresolved external symbol ZGEEV
eigenhh1.obj: error LNK2019: unresolved external symbol DSAUPD
eigenhh1.obj: error LNK2019: unresolved external symbol DSEUPD
eigenhh1.obj: error LNK2019: unresolved external symbol DAXPY
eigenhh1.obj: error LNK2019: unresolved external symbol DNRM2
eigenhh1.obj: error LNK2019: unresolved external symbol DMOUT
zndrv1.obj: error LNK2019: unresolved external symbol ZNAUPD
zndrv1.obj: error LNK2019: unresolved external symbol ZNEUPD
zndrv1.obj: error LNK2019: unresolved external symbol ZAXPY
zndrv1.obj: error LNK2019: unresolved external symbol DZNRM2
zndrv1.obj: error LNK2019: unresolved external symbol DLAPY2

Is this due to not correctly including the ARPACK library, or is it a normal occurrence because LAPACK is not called? If I simultaneously call MKL's LAPACK and this ARPACK-NG library, only 5 errors occur:

eigenhh1.obj: error LNK2019: unresolved external symbol DSAUPD
eigenhh1.obj: error LNK2019: unresolved external symbol DSEUPD
eigenhh1.obj: error LNK2019: unresolved external symbol DMOUT
zndrv1.obj: error LNK2019: unresolved external symbol ZNAUPD
zndrv1.obj: error LNK2019: unresolved external symbol ZNEUPD

I'm sorry, I don't know how to format the response properly. This is my first time using GitHub.

[Jiangsese]

I use the Visual studio 2022 in Windows11

[fghoussen]

unresolved external symbol

You must link with the library: gfortran ... -larpack

[fghoussen]

Visual studio 2022 in Windows11

Not sure arpack can be built on Windows the windows way (with IDE like VS) but it should be possible the unix way (using msys)

arpack-ng/.github/workflows/jobs.yml

Lines 253 to 293 in 4caa8f4

	windows_latest_cmake:
	runs-on: windows-latest
	defaults:
	run:
	# Use MSYS2 as default shell
	shell: msys2 {0}
	steps:
	- name: Install MSYS2 build environment
	uses: msys2/setup-msys2@v2
	with:
	update: true
	msystem: MINGW64
	install: >-
	base-devel
	git
	mingw-w64-x86_64-cmake
	mingw-w64-x86_64-ninja
	mingw-w64-x86_64-gcc-fortran
	mingw-w64-x86_64-openblas
	mingw-w64-x86_64-msmpi
	- name: Install MS-MPI (for mpiexec)
	uses: mpi4py/setup-mpi@v1
	- name: Clone and check out repository code
	uses: actions/checkout@v2
	with:
	fetch-depth: 0
	ref: ${{github.event.pull_request.head.ref}} # Branch where changes are implemented.
	repository: ${{github.event.pull_request.head.repo.full_name}} # Repo where changes are implemented.
	- name: Check commit
	run: |
	git log -1
	- name: Run job
	run: |
	mkdir -p build && cd build
	cmake -GNinja -DICB=ON -DEXAMPLES=ON -DMPI=ON ..
	cmake --build . -v
	- name: Run tests
	run: |
	export PATH="/c/Program Files/Microsoft MPI/Bin":$PATH # add mpiexec to msys2 path
	cd build
	ctest --output-on-failure

[Jiangsese]

I'll try it latter and thank you very much for your help.

[fghoussen]

Not sure arpack can be built on Windows the windows way (with IDE like VS)

...Maybe using vcpkg? @FabienPean @juanjosegarciaripoll Can you help @Jiangsese on this? (no idea how to do this as I'am debian based). If so, do not hesitate to detail the doc: https://github.com/opencollab/arpack-ng?tab=readme-ov-file#windows-support

[FabienPean]

Microsoft does not provide Fortran compiler but Intel does, which I believe integrate inside VS, so arpack could be built there. The install via vcpkg relies (at least then) on MSYS2/MinGW64. The issue is not detailed but as you noted above it is most likely a linker issue.

[fghoussen]

@FabienPean : do not hesitate to detail the doc: https://github.com/opencollab/arpack-ng?tab=readme-ov-file#windows-support (how to install compilers on windows? is msys2/mingw64 mandatory? ...)