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Re: time derivate using mupad
Posted:
Jan 17, 2013 1:32 PM


"radu " <rraduconstantin@gmail.com> wrote in message news:kd92ed$mnf$1@newscl01ah.mathworks.com... > 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:
http://www.mathworks.com/help/symbolic/creatingsymbolicvariablesandexpressions.html#bs_tekf1
I'm not sure of the exact syntax to do the equivalent in MuPAD.
 Steve Lord slord@mathworks.com To contact Technical Support use the Contact Us link on http://www.mathworks.com



