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how to find roots of equation having tan(x) or exp(x)

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moonman
moonman 2011-10-3
how to find roots of equation having tan(x) or exp(x)
I know how to calculate roots of polynomial having numerical values but i am stuck with it

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采纳的回答

Wayne King
Wayne King 2011-10-3
Is it a polynomial, or an equation involving tan(x) and exp(x)?
Have you looked at fzero()?
For example, if you have the equation
y = tan(x) and you want find a root near 3
fzero(@tan,3)
Gives you the root at pi.

更多回答（3 个）

Andrei Bobrov
Andrei Bobrov 2011-10-3
fzero(@(x)exp(x)+x-10,0)
fzero(@(x)tan(x)-x-.01,0)
fzero(@(x)tan(x)-x-.01,pi)
moonman
moonman 2011-10-3
These are the equations
*exp(x)+x-10=0
and tan(x)-x-.01=0*
  1 个评论
Wayne King
Wayne King 2011-10-3
then fzero will work as I suggested.
fzero(@(x) exp(x)+x-10,0)
says "Find the zeros of exp(x)+x-10 near 0

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moonman
moonman 2011-10-3
Thanks king and andrei
This equation will calculate roots for tan in radians
what if i have taken x in degrees
how will i calculate roots

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