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Showing content from https://github.com/j3-fortran/fortran_proposals/issues/103 below:

Identity matrix intrinsic · Issue #103 · j3-fortran/fortran_proposals · GitHub

An intrinsic to define an identity matrix would be nice. For example, Matlab has this.

real(wp),dimension(4,4),parameter :: I = eye(4)

real(wp),dimension(4,4),parameter :: I = reshape([1.0_wp,0.0_wp,0.0_wp,0.0_wp,&
                                                  0.0_wp,1.0_wp,0.0_wp,0.0_wp,&
                                                  0.0_wp,0.0_wp,1.0_wp,0.0_wp,&
                                                  0.0_wp,0.0_wp,0.0_wp,1.0_wp],[4,4])

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