Date: Jan 17, 2013 1:32 PM
Author: Steven Lord
Subject: Re: time derivate using mupad

"radu " <> wrote in message
> Hello,
> I have this equation: f:= a*x^2 + b
> how can i derivate this with rapport to the time just around x using a and
> b as constants.

Unless you've specified that x is a function of t, f is constant with
respect to t and so the derivative WRT time should be 0.

> this is what i want to obtain:
> f:=2*a*x*x'
> is there a way to desine a as a constant so the program will not derivate
> it also?

If you're doing this with Symbolic Math Toolbox:

I'm not sure of the exact syntax to do the equivalent in MuPAD.

Steve Lord
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