LAPACK95

June 20, 2022 ยท View on GitHub

DOI ci_linux

CMake enhanced Netlib LAPACK95, downloading and using original unmodified source code. Easy to build and include in most projects and operating system.

Option -Darith= sets which precision to build (default d):

  • s: float32
  • d: float64
  • c: complex32
  • z: complex64

Build with CMake and a Fortran compiler. The build yields under the build/ director:

  • liblapack95.a
  • Fortran module files in include/*.mod.
cmake -B build
cmake --build build

To install under ~/.local/

cmake -DCMAKE_INSTALL_PREFIX=$HOME/.local -B build

cmake --build build --parallel

cmake --install build

Use in a cmake project

This library can be used inside a cmake project by adding this repository with add_subdirectory. One can for example use FetchContent in your existing project:

cmake_minimum_required(VERSION 3.14)

project(myproject Fortran)

include(FetchContent)
FetchContent_Declare(
    lapack95
    GIT_REPOSITORY https://github.com/scivision/LAPACK95.git
)

FetchContent_MakeAvailable(lapack95)

add_executable(myexe ${CMAKE_CURRENT_SOURCE_DIR}/myexe.f90)
target_link_libraries(myexe ${LAPACK_LIBRARIES} lapack95)

Examples

! Double precision
use la_precision, only: wp => dp
use f95_lapack, only: la_gesv

real(wp) :: A(3,3), b(3)

call random_number(A)
b(:) = 3*A(:,1) + 2*A(:,2) - A(:,3)

! Solve Ax=b, overwrite b with solution
call la_gesv(A,b)

print *, b
end program

! Output (exact: 3 2 -1):
! 2.9999999999999978        2.0000000000000018       -1.0000000000000004