how to plot roots with a value used in the function?

2019 10 23

1 个回答

13 次查看（30 天）

0 个投票

I'm pretty new to matlab so sorry if this question seems trivial.

My function is y = x^2 + bx -20. Im trying to find the roots for when b = 0 to 10 then plot the roots as a function of b.

So far Ive tried to do somethin like this but the graph comes up empty.

for b = 0:10
    p = [1 b -20];
    r = roots(p)
    plot(r, b)
end

Suggestions? Any help is great thanks

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Walter Roberson 2019-10-23

0 个投票

for b = 0:10
    p = [1 b -20];
    r = roots(p);
    plot(b, r, 'k*');
    hold on
end
hold off

Brian S. 2019-10-23

cool it works thanks

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