Hp 49g+ User Manual download pdf (Page 156)

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Suppose that you have a need to evaluate this function for a number of

discrete values and, therefore, you want to be able to press a single button

and get the result you want without having to type the expression in the right-

hand side for each separate value. In the following example, we assume you

have set your calculator to ALG mode. Enter the following sequence of

keystrokes:

„à³~h„Ü~„x™‚Å

‚¹~„x+1™+„¸~„x`

The screen will look like this:

Press the J key, and you will notice that there is a new variable in your soft

menu key (@@@H@@). To see the contents of this variable press ‚@@@H@@. The screen

will show now:

Thus, the variable H contains a program defined by:

<<  x ‘LN(x+1) + EXP(x)’ >>

This is a simple program in the default programming language of the HP 48

G series, and also incorporated in the HP 49 G series. This programming

language is called UserRPL. The program shown above is relatively simple

and consists of two parts, contained between the program containers << >>:

• Input:  x  x

• Process: ‘LN(x+1) + EXP(x) ‘

This is to be interpreted as saying: enter a value that is temporarily assigned

to the name x (referred to as a local variable), evaluate the expression

between quotes that contain that local variable, and show the evaluated

expression.

To activate the function in ALG mode, type the name of the function followed

by the argument between parentheses, e.g., @@@H@@@ „Ü2`. Some

examples are shown below:

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Hp 49g+ User Manual Page 156

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