how to differentiate a list?
- To: mathgroup at smc.vnet.net
- Subject: [mg25940] how to differentiate a list?
- From: Rob <piovere at pdq.net>
- Date: Fri, 10 Nov 2000 02:40:18 -0500 (EST)
- Organization: PDQ.net (using Airnews.net!)
- Sender: owner-wri-mathgroup at wolfram.com
I needed to get the derivative of a time varying pulse to do some
numerical
operations. As seen below, the only way I could figure how to do it
was to generate two lists, shifted by one sample and then subtract them:
***************
del = 0.002; a = 12\[Pi]; b = \[Pi];
( s[t] is a function of t defining the pulse )
sd = Table[N[s[t]], {t, 0, 1, del}];
sd1 = Table[N[s[t]], {t, del, 1 + del, del}];
diff = sd - sd1;
****************
I looked all over and I didn't find a list operation available to do
this. I bet
you Mathematica gurus know how to do this. If so, could you enlighten me?
Thanks, Rob