(12C) Signum Function

[Dieter]

(03-02-2019 03:00 AM)Gerson W. Barbosa Wrote:  

Code:

01 ENTER 
02 CHS
03 x<=y
04 CHS
05 x=0
06 n!
07 /

That's a nice one. I probably would have used e^x to convert 0 into 1, but n! does it either, and maybe it's a tiiiiiiiiiny bit faster.

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.
And again it does not have the problems of the x² √x method: it neither underflows for very small values not does it cause inaccuracies for about one out of five arguments (cf. Thomas' post).

Dieter