Return true if x is a complex-valued numeric object.
— Built-in Function: ismatrix (a)
Return 1 if a is a matrix. Otherwise, return 0.
— Function File: isvector (a)
Return 1 if a is a vector. Otherwise, return 0.
— Function File: isscalar (a)
Return 1 if a is a scalar. Otherwise, return 0.
— Function File: issquare (x)
If x is a square matrix, then return the dimension of x.
Otherwise, return 0.
— Function File: issymmetric (x, tol)
If x is symmetric within the tolerance specified by tol,
then return the dimension of x. Otherwise, return 0. If
tol is omitted, use a tolerance equal to the machine precision.