HP 40gs Bedienungsanleitung PDF herunterladen (Seite 263)

100

101

Equation Writer 15-11

How to modify an expression

If you’re typing an expression, the key enables you

to erase what you’ve typed. If you’re selecting, you can:

• Cancel the selection without deleting the expression

by pressing . The cursor moves to the end of the

deselected portion.

• Replace the selection with an expression, just by

typing the desired expression.

• Transform the selected expression by applying a CAS

function to it (which you can invoke from one of CAS

menus along the bottom of the screen).

• Delete the selected expression by pressing:

• Delete a selected unary operator at the top of the

expression tree by pressing:

For example, to replace SIN(expr) with COS(expr),

select SIN(expr), press and then press

COS.

• Delete a binary infix operator and one of its

arguments by selecting the argument you want delete

and pressing:

For example, if you have the expression 1+2 and

select 1, pressing deletes 1+ and leaves

only 2. Similarly, to delete F(x)= in the expression F(x)

= x

– x +1, you select F(x) and then press

. This produces x = x

– x +1.

• Delete a binary operator by selecting:

Edit expr.

from the menu and then making the correction.

• Copy an element from CAS history. You access CAS

history by pressing . See page 15-19 for

details.

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