How do I create a matlab function using polyder that not only gives the coefficients but also gives the equation

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whyamiincollege 2019-4-29

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https://ww2.mathworks.cn/matlabcentral/answers/459275-how-do-i-create-a-matlab-function-using-polyder-that-not-only-gives-the-coefficients-but-also-gives

编辑： madhan ravi 2019-5-12

采纳的回答： gonzalo Mier

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My code so far (doesnt work):

function derivativecoefficient  = derivpolycalc()
a = input('Enter the coefficent of the polynomial')
x == x
n = input('Enter the power of each x')
derivativecoefficient = polyder(a)
derivative = derivativecoefficient*x^(n - 1)
end

If i just do it where it shows the coeeficents, I could simply do:

function derivativecoefficient  = derivpolycalc()
a = input('Enter the coefficent of the polynomial')
derivativecoefficient = polyder(a)
>> derivpolycalc
Enter the coefficent of the polynomial[3,2,5]
a =
     3     2     5
derivativecoefficient =
     6     2
ans =
     6     2

BUT I want a code that will display

6x^2+2x+0..

or maybe it could display

6x^5+2x^3+0

depending on what the original function was.

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gonzalo Mier 2019-4-29

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编辑：madhan ravi 2019-5-12

I think you need here the function poly2sym:

https://www.mathworks.com/help/symbolic/poly2sym.html

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whyamiincollege 2019-4-29

Thanks!

gonzalo Mier 2019-5-12

编辑：gonzalo Mier 2019-5-12

Accept the answer if it worked for you! :)

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