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MathGroup Archive 1999

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Re: Basic Laplace Transforms

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20511] Re: [mg20422] Basic Laplace Transforms
  • From: "Tomas Garza" <tgarza at mail.internet.com.mx>
  • Date: Wed, 27 Oct 1999 02:05:06 -0400
  • Sender: owner-wri-mathgroup at wolfram.com


Don Metcalf [dmetcalf at fishinternet.com.au] wrote:

> I am fairly new to Mathematica and can't understand why the program won't
> evaluate simple laplace transforms.  I am entering in the example exactly
> from the help file and still it doesn't work.  It just outputs what I have
> typed in.  Can someone help.  If I am doing something wrong, the user
> interface sure is not user friendly.

It is, provided you do what you're supposed to. You must first load the
LaplaceTransform AddOn :

In[1]:=
<<Calculus`LaplaceTransform`

In[2]:=
LaplaceTransform[Sin[t], t, s]

Out[2]=
1/(1 + s^2)

If you called LaplaceTransform before loading the AddOn (in the same
session), be sure to remove it before calling it again in order to avoid
shadowing problems:

In[3]:=
Remove[LaplaceTransform]


Tomas Garza
Mexico City



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