# Variables

You can store numbers, matrices or functions in variables for reuse in future calculations. All variables are listed in the menu that appears when you press the var key on the calculator.

Variable names (expression or function) can be freely chosen using the characters : a..z, A..Z, 0..9 and _. A variable name cannot start with a number nor contain more than 7 characters.

To make a capital letter press shift then alpha then press the key with the desired letter.

## Numbers

The numeric variables available in the calculator are stored in the Expressions section in the var menu.

To store a number in a variable, type the number to store then insert the arrow sto (by pressing shift then x^y) followed by the desired variable name. For example to store $5$ in $a$ type : 5→a. Then press EXE to confirm.

## Matrices

The matrix variables available in the calculator are stored in the Expressions section in the var menu.

To store a matrix in a variable, type the matrix to store then insert the arrow sto (by pressing shift then x^y) followed by the desired variable name. For example to store $\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}$ in $m1$ type: [[1,0][0,1]]→m1. Then press EXE to confirm.

## Functions

The functions available in the calculator are stored in the Functions section in the var menu.

To store a function in a variable, type the function expression to store then insert the arrow sto (by pressing shift then x^y) followed by the desired variable name. For example to store $f(x)=2x+3$ type: 2x+3→f(x). Then press EXE to confirm.

## The var key

When editing text, you can press var at any time to open the Variables menu. This menu allows you to access the different variables stored in the memory.

Press OK on the desired variable to insert it in your calculation.

Press del to delete the selected variable.