TI92 Diff. Eq. Programs

To: CALC-TI@LISTS.PPP.TI.COM
Subject: TI92 Diff. Eq. Programs
From: Eric Scrimpsher <escrimp@MICHELE.GCCCD.CC.CA.US>
Date: Fri, 30 May 1997 08:34:39 -0700
Reply-To: Eric Scrimpsher <escrimp@MICHELE.GCCCD.CC.CA.US>

For all of you who have finals next week, here you go:

VARIATION OF PARAMETERS
Solves differential equations of the form
     Ay"+By'+Cy=f(x). Where A,B and C
     are constants.
 
FIND PHI
Nice little program that determines if a
parametric or differential equation is
conservative (or exact), then finds the parent
equation. It also lets you evaluate it at end
points.
 

WRONSKI
A Function that returns the wronskian of
any number of equations entered in as a
list. Saves A LOT of typing.
  

For personal reasons these programs do not give all the steps in producing the solution.  However, they are programmed to solve in the classic text book manner, so a simple 'disp' command in the right spots, and you can check yourself every step of the way.

Good Luck
Eric Scrimpsher

vop.92g

Findphi.92g

Wronski.92g

usage
wronski({expression1,expression2, ...},var)

There can be any number of expressions, but they must be input as a list in{}.
var is the variable to take the derivitives with respect to.

Skalsher

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