Solving equation for a value of x

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ali koulani
ali koulani 2020-12-8
回答： XueHuang 2023-11-10
hi everyone
this is a pretty basic question but i couldnt find an answer to it
i have a 5th order polynomial function g(x) which im trying to find the slope of it at a given point x = 20
im using matlab R2020a

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Stephan
Stephan 2020-12-8
编辑：Stephan 2020-12-8
You can use polyder, that calculates the derivative of a polynomial and then you can calculate the result at x=20 using polyval.

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XueHuang
XueHuang 2023-11-10
您可以使用polyder计算多项式的导数，然后可以使用polyval计算x=20时的结果.
polyval(polyder(x,a),20);就是这样的

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