Another way to solve this problem is to use the inv function, which return the inverse of its argument. 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.