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From: ds@dodger.ATT.COM (Doug Sturim,1A-138,2105,TRW)
Newsgroups: comp.sys.handhelds
Subject: Laplace Transforms on the HP-48
Keywords: 48, Laplace
Message-ID: <4763@cbnewsl.ATT.COM>
Date: 26 Mar 90 17:42:28 GMT
Sender: nntp@cbnewsl.ATT.COM
Reply-To: ds@dodger.ATT.COM
Organization: AT&T Bell Laboratories
Lines: 38


Ever since I saw the hp48s "match" function I have been in awe of its
power.  Last night I implement a simple Laplace transform table.  With
a little thought you can produce surprisingly general Laplace transforms
thanks to the global variables provided in the command. My program was of
the simple form:

<<

{' equation1 ' ' L_equation1 ' }
match
drop

{' equation2 ' ' L_equation2 ' }
match
drop

>>

When my MAC interface comes in (giving my access to a better text editor)
implementing a more substantial table will be a cake walk.  

You can also use the match command to solve integrals ,inverse Laplace
transforms, z-transform , trig identities (like the example in the user 
manual) and most any transformation you can think of. The only weakness I can
see is little algebra differences in the equations can stump the match 
command. I guess I'm stating the obvious, but I'm really psyched about this 
function.


Doug


------------------------------------------------------
Doug Sturim
TRW New London, CT
att!chinet!mcdchg!clyde!ds
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