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! Program to test the MATMUL intrinsic
program intrinsic_matmul
implicit none
integer, dimension(2, 3) :: a
integer, dimension(3, 2) :: b
integer, dimension(2) :: x
integer, dimension(3) :: y
integer, dimension(2, 2) :: r
integer, dimension(3) :: v
real, dimension (2,2) :: aa
real, dimension (4,2) :: cc
a = reshape((/1, 2, 2, 3, 3, 4/), (/2, 3/))
b = reshape((/1, 2, 3, 3, 4, 5/), (/3, 2/))
x = (/1, 2/)
y = (/1, 2, 3/)
r = matmul(a, b)
if (any(r .ne. reshape((/14, 20, 26, 38/), (/2, 2/)))) STOP 1
v = matmul(x, a)
if (any(v .ne. (/5, 8, 11/))) STOP 2
v(1:2) = matmul(a, y)
if (any(v(1:2) .ne. (/14, 20/))) STOP 3
aa = reshape((/ 1.0, 1.0, 0.0, 1.0/), shape(aa))
cc = 42.
cc(1:2,1:2) = matmul(aa, transpose(aa))
if (any(cc(1:2,1:2) .ne. reshape((/ 1.0, 1.0, 1.0, 2.0 /), (/2,2/)))) STOP 4
if (any(cc(3:4,1:2) .ne. 42.)) STOP 5
end program
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