symbolically differentiating of a function not to be mixed with other constants

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farzad
farzad 2014-12-8
回答： A Jenkins 2014-12-8
Hi All
I was reading this link here
to derivate symbolically this equation :
p= c1*r +c2/r ;
the problem is that when you write : y=sym('y(t)') ;
then you can not define the function , to derivate and see the result , because it will only be like : diff(p(r), r) ;
but if I write the function as above , how can I make matlan know that r is the variable and the rest are just constants ?

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A Jenkins
A Jenkins 2014-12-8
syms r c1 c2
p=c1*r+c2/r
diff(p,r)
_________________
ans =
c1 - c2/r^2

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