I want to take an Equation as input like ax^2+bx+c =0 , Now I want to take the co-efficient. What will be the code?

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Sourin Dey
Sourin Dey 2016-6-20
编辑： Karan Gill 2017-10-17
I want to take an Equation as input like ax^2+bx+c =0 , Now I want to take the co-efficient. What will be the code?

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回答（1 个）

Karan Gill
Karan Gill 2016-6-20
编辑：Karan Gill 2017-10-17
You could try the coeffs command. Note that coeffs accepts polynomial input, not equation input.
>> syms a b c x
poly = a*x^2 + b*x + c;
C = coeffs(poly, x)
C =
[ c, b, a]
You might prefer flipping the order of C to match the order of f.
>> fliplr(C)
ans =
[ a, b, c]
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Sourin Dey
Sourin Dey 2016-6-24
编辑：Sourin Dey 2016-6-24
Thanks for your comment, but I want to take the equation as input,It can be any equation . I mean user input . then will take the coefficients from the equation. My purpose is to develop a code for Newton-Raphson Method.

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