Re: question
- To: mathgroup at smc.vnet.net
- Subject: [mg43547] Re: [mg43473] question
- From: Selwyn Hollis <selwynh at earthlink.net>
- Date: Fri, 19 Sep 2003 03:42:18 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On Thursday, September 18, 2003, at 05:38 AM, Aslaninejad Morteza wrote: > > 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 http://www.math.armstrong.edu/faculty/hollis