HP Prime Graphing NW280AAABA manual Reusing previous expressions and results

Explicit and implied multiplication

Large results

Implied multiplication takes place when two operands appear with no operator between them. If you enter AB, for example, the result is A*B. Notice in the example on page 38 that we entered 14Sk8 without the multiplication operator after 14. For the sake of clarity, the calculator adds the operator to the expression in history, but it is not strictly necessary when you are entering the expression. You can, though, enter the operator if you wish (as was done in the examples on page 39). The result will be the same.

If the result is too long or too tall to be seen in its entirety—for example, a many-rowed matrix—highlight it

and then press . The result is displayed in full- screen view. You can now press =and \(as well as >and <) to bring hidden parts of the result into view.

Tap to return to the previous view.

Reusing previous expressions and results

Being able to retrieve and reuse an expression provides a quick way of repeating a calculation that requires only a few minor changes to its parameters. You can retrieve and reuse any expression that is in history. You can also retrieve and reuse any result that is in history.

To retrieve an expression and place it on the entry line for editing, either:

•tap twice on it, or

•use the cursor keys to highlight the expression and

then either tap on it or tap .

To retrieve a result and place it on the entry line, use the

cursor keys to highlight it and then tap .

If the expression or result you want is not showing, press

=repeatedly to step through the entries and reveal those that are not showing. You can also swipe the screen to quickly scroll through history.

40 Getting started