#include "libstd" proc main() { var a = {1.,0.,-1.,0.}.reshape(2,2); var b = {0.,1.,0.,-1.}.reshape(2,2); var c = [1.,0.,-1.,0.].reshape(2,2); var d = [0.,1.,0.,-1.].reshape(2,2); "", ' ', a.atan2(b), '\n'; "", ' ', c.atan2(d), '\n'; }