subroutine foo(a, n, m, b)
implicit none
real, intent(in) :: a(n, m)
integer, intent(in) :: n, m
real, intent(out) :: b(size(a, 1))
integer :: i
do i = 1, size(b)
b(i) = sum(a(i,:))
enddo
end subroutine
subroutine trans(x,y)
implicit none
real, intent(in), dimension(:,:) :: x
real, intent(out), dimension( size(x,2), size(x,1) ) :: y
integer :: N, M, i, j
N = size(x,1)
M = size(x,2)
DO i=1,N
do j=1,M
y(j,i) = x(i,j)
END DO
END DO
end subroutine trans
subroutine flatten(x,y)
implicit none
real, intent(in), dimension(:,:) :: x
real, intent(out), dimension( size(x) ) :: y
integer :: N, M, i, j, k
N = size(x,1)
M = size(x,2)
k = 1
DO i=1,N
do j=1,M
y(k) = x(i,j)
k = k + 1
END DO
END DO
end subroutine flatten
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