It is sometimes useful to multiply or divide matrices element-wise. Some functions change the order of elements. Use dot-tick if you just want to reverse the rows and columns. However, a class of functions has a paramount importance in numerical computing, the polynomials. Some control characters have a special representation.
Strings are actually matrices of characters.
You can store the result of an expression into what is called a variable. You can have as many variables as you want and the memory permits. Each variable has a name to retrieve the value it contains. You can change the value of a variable as often as you want. 9 Note that a command terminated by a semicolon does not display its result.