       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

```

• Prev by Date: Re: Bug: Mathematica 4.0 vs. Win2k on ThinkPad
• Next by Date: Re: Ordering polynomials from highest to lowest order
• Previous by thread: Re: ProbabilityPlot
• Next by thread: Re: how to differentiate a list?