# How do I find the identity of a matrix on a graphing calculator?

##### 1 Answer
Dec 17, 2014

An Identity matrix is a square matrix with all entries being 1 or 0, in a certain prescribed pattern or array:

Ex:

So, you don't need to "find" an Identity matrix, you can just "have" an Identity matrix. But what is the Identity matrix needed for?

If you multiply an appropriately shaped matrix by the Identity matrix, you will be returned to your original matrix. This operation would be similar to the multiplication identity $a \cdot 1 = a$.