| isnumeric (x) | Built-in Function |
| Return nonzero if x is a numeric object. |
| isreal (x) | Built-in Function |
| Return true if x is a real-valued numeric object. |
| iscomplex (x) | Built-in Function |
| Return true if x is a complex-valued numeric object. |
| ismatrix (a) | Built-in Function |
| Return 1 if a is a matrix. Otherwise return 0. |
| isvector (a) | Function File |
| Return 1 if a is a vector. Otherwise return 0. |
| isscalar (a) | Function File |
| Return 1 if a is a scalar. Otherwise return 0. |
| issquare (x) | Function File |
| If x is a square matrix then return the dimension of x. Otherwise return 0. |
| issymmetric (x tol) | Function File |
| 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. |
| isbool (x) | Built-in Functio |
| Return true if x is a boolean object. |