# How do I use xline() to plot values calculated in a for loop?

12 views (last 30 days)
Michael Boyte on 19 Apr 2023
Commented: Les Beckham on 19 Apr 2023
I am trying to plot a set of vertical lines where each line's x-value is i/d where i iterates from 1 to d and d is a denominator that is calculated based on user input, beta. My code looks like this:
[n, d] = numden(sym(beta));
for i = 1:d
x(i) = i/d;
end
xline([x])
But I get this error:
Error using matlab.graphics.internal.xyzline
Value must be one of the following: 'numeric' | 'datetime' | 'categorical' | 'duration'
Error in xline (line 35)
h = matlab.graphics.internal.xyzline('x', args);
If beta = 0.75, then x = [1/4, 1/2, 3/4, 1], which is exactly what I want. I have noticed that if I manually set x to be [1/4, 1/2, 3/4, 1], then it works, but if i use the for loop to calculate x, it does not work despite x being, as far as I can tell, identical. Is what I'm wanting to do possible?

Les Beckham on 19 Apr 2023
Your x is going to be symbolic based on the code you posted (you can verify this by using the whos in the Command Window or by looking in the Workspace window). If you must calculate x symbolicly, you can convert it to numeric using the double command.
Michael Boyte on 19 Apr 2023
That did it. Thanks!
Les Beckham on 19 Apr 2023
You are quite welcome.

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