proc transpose . m[][] .
len n[][] len m[1][]
for i to len n[][]
for j to len m[][]
n[i][] &= m[j][i]
.
swap n[][] m[][]
m[][] = [ [ 1 2 3 4 ] [ 5 6 7 8 ] [ 9 10 11 12 ] ]
print m[][]
print ""
transpose m[][]