(12C) Signum Function

[Gerson W. Barbosa]

(03-04-2019 10:57 AM)Dieter Wrote:  This also makes a nice ABS code:

Code:

01 ENTER 
02 CHS
03 x<=y
04 CHS

This leaves the original input in Y and its absolute value in X.

In order to use that as a function I’d rather get rid of the original input, but I cannot do it in less than five steps on the HP-12C:

Code:


01 0
02 x<=y
03 x<>y
04 -
05 CHS

On the HP-25 it can be done with four steps:

Code:


01 0
02 x>y
03 x<>y
04 -

It won’t beat the usual method, though:

Code:


01 x^2
02 sqrt

|-3.43142| = 3.431420001 might not be much of problem for most applications, I think.

Gerson.