How to extract terms from polynomial in syms

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Sohail 2014-1-2

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编辑： Azzi Abdelmalek 2014-1-2

Dear all, I want to extract terms from polynomial formed using syms. Here is the code

smys x a

y= x^4 + a*x^3 + 2*a^2*x + 5;

now i need to extract the terms x^4 a*x^3 etc into a new variable that can be used at some other place. like

w=x^4;

r=a*x^3;

d=w+r;

Kindly help on this thanks.

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Amit 2014-1-2

Didn't you answer your own question? Isn't w,r,d are what you want? Am I missing something?

Sohail 2014-1-2

Hi amit, I need to extract these terms using y instead. when not using syms we can use y(1) or y(2) and so on to get the required values but here it is symbolic so not sure how to do it. Thanks

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Azzi Abdelmalek 2014-1-2

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编辑：Azzi Abdelmalek 2014-1-2

在 MATLAB Online 中打开

You can use coeffs function

syms x a
y= x^4 + a*x^3 + 2*a^2*x + 5;
[variable,coefficient]=coeffs(y,x)

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Mathematics and Optimization Symbolic Math Toolbox Symbolic Computations in MATLAB Conversion Between Symbolic and Numeric

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