How to extract just one value?

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jchris14
jchris14 2014-4-25
评论： jchris14 2014-4-25
Hi,
suppose I have a polynomial plot and find roots using the "roots" command and i get vector with 2 or more values. How do i just get one particular value out of the 2 or more values?
Thanks

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Walter Roberson
Walter Roberson 2014-4-25
Index it. For example,
r = roots([9, 2, 4, -7]);
disp(r(1))
If you want to look for real roots then
r(imag(r)==0)
will return only real-valued roots

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