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Re: question

  • To: mathgroup at
  • Subject: [mg43547] Re: [mg43473] question
  • From: Selwyn Hollis <selwynh at>
  • Date: Fri, 19 Sep 2003 03:42:18 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

On Thursday, September 18, 2003, at 05:38  AM, Aslaninejad Morteza 

> I have solved a differential equation numerically with NDSolve and 
> now, I
> would like to do the following step but I don't know how?
> 1- Take the derivative of the answer first.

Presumably, if you've solved a 1st-order DE, the derivative is already 
known and can be calculated from the DE itself. Otherwise, try D?

> 2- Sum the square of answer and the square of the derivative secondly.
> thanks in advance

a^2 + b^2 ?  (Sorry...)

Selwyn Hollis

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