File: functions_19.f90

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pure function diag_rsp_mat(A) result(res)
real, intent(in) :: A(:,:)
real :: res(minval(shape(A)))

res = 123.71_4
end function diag_rsp_mat

program funtions_19
real :: A(3,3)
real :: res(3)
interface
pure function diag_rsp_mat(A) result(res)
real, intent(in) :: A(:,:)
real :: res(minval(shape(A)))
end function diag_rsp_mat
end interface

res = diag_rsp_mat(A)
print *, res
if (any(abs(res - 123.71_4) > 1e-8)) error stop
end program