Holding Plots In A Loop

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Amritpal Kaur
Amritpal Kaur 2016-11-3
回答： Nick Counts 2016-11-4
Hello,
I am trying to subplot 2 figures, i.) n-th roots of unity and ii.) one other complex number. While the complex number plot comes as fine, the root of unity plot Windows is lefts blank, additionally I get another blank window. Where have I mistaken? Here is the code:
figure
subplot(2,1,1) % add first plot in 2 x 1 grid
plot(c1, '+');
title('Plot of the Product')
subplot(2,1,2)
hold on;
while lim_plot > 0
plot(nthroot(1,lim_plot), '*');
lim_plot = lim_plot - 1;
end
hold off;
title('Roots of Unity')
So, instead of having multiple superimposed plots for root's of unity, I have just 1. I want all the roots of unity until the user input limit lim_plot to be superimposed in the second graph!
Thanks.

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回答（1 个）

Nick Counts
Nick Counts 2016-11-4
Your sample code was missing some variable definitions, so there may be other issues, but here is what I see:
Assuming that you are passing your lim_plot > 0 test, your next line is calls nthroot on the vector [1] and asks for the lim_plot^th real root of [1].
help nthroot
If I change that line to:
plot(nthroot(c1,lim_plot), '*');
I get the output you are looking for (assuming that my dummy lim_plot and c1 variables are similar to yours).
Hopefully that helps.
Cheers

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