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

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Brian S.
Brian S. 2019-10-23
评论： Brian S. 2019-10-23
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
Walter Roberson 2019-10-23
for b = 0:10
p = [1 b -20];
r = roots(p);
plot(b, r, 'k*');
hold on
end
hold off

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