solving a x^4 function using roots, how?

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Rand Renwar
Rand Renwar 2016-9-30
回答： dbmn 2016-9-30
I've read about roots but I didn't quite understand it. If I have a function, how do I find the roots? By using the function roots. y = x^(4) - 2*x^(3) - 4*x^(2) - 2*x - 12
I've tried roots(y) but got the answer: >> roots(y)
ans =
Empty sym: 0-by-1
I'm not sure what it means..

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回答（1 个）

dbmn
dbmn 2016-9-30
Hi Rand,
check out the documentation https://de.mathworks.com/help/matlab/ref/roots.html
it uses a certain way of notation. f.ex. for f(x) = 3x^2 -2x -4, you would use
p = [3 -2 -4];
r = roots(p)

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