Hp 49g+ User Manual download pdf (Page 157)

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In the RPN mode, to activate the function enter the argument first, then press

the soft menu key corresponding to the variable name @@@H@@@ . For example,

you could try: 2`@@@H@@@ . The other examples shown above can be

entered by using: 1.2`@@@H@@@ , 2/3`@@@H@@@ .

Functions can have more than 2 arguments. For example, the screen below

shows the definition of the function K(α,β) = α+β, and its evaluation with the

arguments K(√2,π), and K(1.2,2.3):

The contents of the variable K are: <<  α β ‘α+β’ >>.

Functions defined by more than one expression

In this section we discuss the treatment of functions that are defined by two or

more expressions. An example of such functions would be

The HP 49 G provides the function IFTE (IF-Then-Else) to describe such

functions.

The IFTE function

The IFTE function is written as

IFTE(condition, operation_if_true, operation_if_false)

If condition is true then operation_if_true is performed, else operation_if_false

is performed. For example, we can write ‘f(x) = IFTE(x>0, x^2-1, 2*x-1)’, to

describe the function listed above. Function IFTE is accessible from the

function catalog (‚N). The symbol ‘>’ (greater than) is available as













>−

<−⋅

0,1

0,12

)(

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Hp 49g+ User Manual Page 157

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