MatrixQ - Test whether a nested array i a matrix
[array] MatrixQ -> true | false
[1 2 3] MatrixQ -> true
[[1 2] [3 4]] MatrixQ -> true
[[1] [2 3]] MatrixQ ->False
This version fails on the third example
Marc-Oliver Gewaltig
/usr/src/packages/BUILD/lib/sli/mathematica.sli