class — Type of entity
class returns a string which identifies what the argument is.
There are four possible return strings
num for scalar and numeric matricies.
string for strings and string matricies
list for lists
function for built-in and user defined functions.
This function is very useful inside user-defined functions, for both
error checking and decision making.
The class of a variable or function can also be determined by using the
class member reference, as shown below. This technique does not
work for a list unless you have given it a class element.
Subsections