Matlab finding Real roots and Complex roots

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Christina Himeda 2020-6-14

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https://ww2.mathworks.cn/matlabcentral/answers/547812-matlab-finding-real-roots-and-complex-roots

评论： Christina Himeda 2020-6-15

采纳的回答： Abhivandan Pandey

I have this problems and I cant figure it out how to do, please help me towards it thank you

Use MATLAB to determine the real and complex roots of:

(a) f (x) = x3 − x2 + 2x − 2

(b) f (x) = 2x4 + 6x2 + 8

(c) f (x) = x4 − 2x3 + 6x2 − 2x + 5

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Answer 1

Abhivandan Pandey 2020-6-14

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编辑：Walter Roberson 2020-6-14

Hi Christina,

I understand you want to calculate the roots of a polynomial using MATLAB. There's a function roots() which takes in coeffecients of a polynomial as a vector and returns the roots of the polynomial.

Here's the documentation link for the function:https://in.mathworks.com/help/matlab/ref/roots.html

Regards,

Abhivandan

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Walter Roberson 2020-6-14

I corrected your reference from root() to roots() . The link you posted, to roots(), is a good one for true polynomials with purely numeric coefficients.

There is also a function named root(), which is part of the symbolic toolbox, and can accept symbolic coefficients. It is not typically called by the user directly, and is much more often seen as a placeholder when solve() is used; https://www.mathworks.com/help/symbolic/sym.root.html

Christina Himeda 2020-6-15