Path: utzoo!attcan!uunet!elroy.jpl.nasa.gov!decwrl!pa.dec.com!shlump.nac.dec.com!deland.enet.dec.com!edp
From: edp@deland.enet.dec.com (Eric Postpischil (Always mount a scratch monkey.))
Newsgroups: comp.sys.handhelds
Subject: Re: 48 graphing question
Message-ID: <20602@shlump.nac.dec.com>
Date: 28 Feb 91 13:40:19 GMT
References: <1991Feb27.135704@madden.enet.dec.com>
Sender: newsdaemon@shlump.nac.dec.com
Reply-To: edp@deland.enet.dec.com (Eric Postpischil (Always mount a scratch monkey.))
Organization: Digital Equipment Corporation
Lines: 30

In article <1991Feb27.135704@madden.enet.dec.com>, wpmadden@madden.enet.dec.com
writes:

>I would like to be able to enter transient functions without having to enter
>a boolean expression in << >> at the equation prompt. When I tried to do
>this the program kept wanting to evaluate. Is there a way around this, or
>better yet, a method of graphing two functions, one t<0 and the other t>0
>at the same time?

I'm sorry, but this isn't clear.  What "equation prompt" are you referring to? 
Is this one of the calculator's prompts or a prompt from your program?

About graphic two functions, do you want one function to be used in the region
t<0 and another in t>0, or are you asking for a way to plot two functions in the
same area with different values of the independent variable?

The former can be done with 'IFTE(t<0,f(t),g(t))'.  The latter can be done with
'f(shift(t))=g(t)', where 'shift(t)' is something like '-t' or 't-d', depending
on whether you want to reflect f onto the positive area or shift it by a
distance of d onto the positive area.  Actually, if you use the latter, you
could use this hack:  Put \<< PPAR 1 GET C\->R DROP PPAR 2 GET C\->R DROP - 131
/ 132 * \>> in 'd'  That will cause d to automatically assume the value of the
width of your plotting area, so 'f(t-d)' will automatically plot f over the
range one screen to the left of the plot screen, but it will appear on the plot
screen.


				-- edp (Eric Postpischil)
				"Always mount a scratch monkey."
				edp@jareth.enet.dec.com