HP Prime Graphing NW280AAABA manual Storing a value in a variable, Sj2E, SjS+E

To reuse an expression or result from the CAS

You can repeat the previous calculation simply by pressing E. This can be useful if the previous calculation involved Ans. For example, suppose you want to calculate the nth root of 2 when n is 2, 4, 8, 16, 32, and so on.

1.Calculate the square root of 2.

Sj2E

2.Now enter √Ans.

SjS+E

This calculates the fourth root of 2.

3.Press E repeatedly. Each time you press, the root is twice the previous root. The last answer shown in the illustration at the right is 32 2 .

When your are working in Home view, you can retrieve an expression or result from the CAS by tapping Zand selecting Get from CAS. The CAS opens. Press =or

\until the item you want to retrieve is highlighted and press E. The highlighted item is copied to the cursor point in Home view.

Storing a value in a variable

You can store a value in a variable (that is, assign a value to a variable). Then when you want to use that value in a calculation, you can refer to it by the variable’s name. You can create your own variables, or you can take advantage of the built-in variables in Home view (named A to Z and θ) and in the CAS (named a to z, and a few others). CAS variables can be used in calculations in Home view, and Home variables can be used in calculations in the CAS. There are also built-in app variables and geometry variables. These can also be used in calculations.

42 Getting started