Simple Diffeq question.
- To: mathgroup@smc.vnet.net
- Subject: [mg11606] Simple Diffeq question.
- From: Craig P Earls <cpearls@ziplink.net>
- Date: Tue, 17 Mar 1998 10:42:56 -0500
- Organization: Netcom
The first second order differential equation to you lear to solve is of
the form
y''[omega * t] + omega^2*y[omega * t]=0
How does one express that in Mathematica 3.0?
I tried:
In[1]:= DSolve[D[y[w t],{t,2}] + w^2 y[w t]==0, y[w t],t]
And received
In[2]:=
DSolve[ D[y[w t],{t,2}] + w^2 y[w t]==0,y[w t], t] DSolve::"nvld":
"The description of the equations appears to be ambiguous or
invalid." DSolve::"deqx":
"Supplied equations are not differential equations of the given
functions."
Out[2]=DSolve[w^2 y[t w] +w^2 y''[t w] ==0,y[t w],t]
??? So far mathematica has worked fairly obviously for the medium
difficult stuff I do (computation differential geometry) but this
surprised me.
--
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Craig P Earls LT US Navy, MIT
Aero/Astro Engineering cpearls@mit.edu
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