isvector
isvector(X) returns true if X is a vector.
Examples
> isvector([1 3]) [ans:true]
> isvector([1 3]') [ans:true]
> isvector([1 3; 1 3]') [ans:false]
> isvector([1 3]) [ans:true]
> isvector([1 3]') [ans:true]
> isvector([1 3; 1 3]') [ans:false]