50g piecewise functions

[Kurt Fankhauser]

Is it possible to plot a piecewise function. I imagine that you would enter a separate Y= function for each segment, but how do you limit the domain of each function?

Also, how do you clear previous defined Y= functions? Every time I add a new one it increments the counter on it (so the latest one is displayed as Y11(x)=...). All previous functions are displayed in the CHOOS box. I want to clear them all. The CLEAR soft key only clears the functions listed in the PLOT-FUNCTION window, but not the CHOOS box.

[Pier Aiello]

For piecewise functions use IFTE (check best of on wiki4hp )

[Kurt Fankhauser]

Thanks Pier. I could not get the IFTE to work correctly with the Y= definition and plotting. The 50g thought for a while then gave an out-of-memory error. I read of others having similar issues.

Instead I found this post which suggested to multiply each segment by a logical domain relational expression:

https://groups.google.com/forum/#!topic/comp.sys.hp48/ZIv5UDxWcHA/discussion

For example,
Y=(X^2)*(X>-1)(X<0)+(x-3)*(X>=0)(X<3)

That worked for me on my 50g with version 50-c revision 2.15 ROM.

[Pier Aiello]

Good :)

[Simone Cerica]

IFTE BUG is present in ROM 2.15: https://groups.google.com/forum/#!topic/comp.sys.hp48/R3Pp62J_9SM

SC

[Pier Aiello]

For the functions in the graph menu, i just found (during my mining task on discussion boards) a really similar question. I'll add it on the page previously linked :)

http://h30499.www3.hp.com/t5/Calculators/impossible-to-reset-functions-in-graph-menus/td-p/5892643

Edited: 15 Sept 2013, 9:13 a.m.

[Kurt Fankhauser]

Thanks Pier. Boy, could they have made this any more difficult?