HP (Hewlett-Packard) 50g ユーザーズマニュアル

Page 3-36

The contents of the variable K are: << 

α β ‘α+β’ >>.

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 function IFTE (IF-Then-Else) describes such functions.

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 (associated 
with the Y key).  To define this function in ALG mode use the command:  
DEF(f(x) = IFTE(x>0, x^2-1, 2*x-1))  then, press `.  In RPN mode, type the 
function definition between apostrophes:

‘f(x) = IFTE(x>0, x^2-1, 2*x-1)’

then press „à.

Press J to recover your variable menu.  The function 

@@@f@@@ should be available 

in your soft key menu.  Press ‚

@@@f@@@ to see the resulting program:

<< 

 x ‘IFTE(x>0, x^2-1, 2*x-1)’ >>

To evaluate the function in ALG mode, type the function name, f, followed by the 
number at which you want to evaluate the function, e.g., f(2), then press `.
In RPN mode, enter a number and press 

@@@f@@@.   Check, for example, that f(2) = 

3, while f(-2) = -5.

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