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how to change line colors in bodes, nichols, nyquist, etc

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Stephen Reiman
Stephen Reiman on 14 Jul 2021
Edited: Stephen Reiman on 15 Jul 2021
I've been trying to change the line colors when plotting 30+ systems and it seems like the routines creating the plots in the title are not using the color order in the gca/axis. When I've accessed the handle through following code it seems like there are still a fixed number of colors available, ~6-7
h.Responses(n).Style.Colors{1} =
h.Responses(n).Style.setstyle
When I start adding more lines and setting the colors then all the previous linecolors are also changed, like a circular buffer of some sort is in use. I've just been trying to a jet and it works for 7 or so lines & colors, but does not work for a number like 30+ unique systems

Answers (2)

Image Analyst
Image Analyst on 14 Jul 2021
See attached demo for how to change the default color order.
  2 Comments
Image Analyst
Image Analyst on 14 Jul 2021
Sometimes you can edit the code and change things. Other times, not, as the m-file calls a mex function.
>> edit nicholsplot.m
See if that gets you anywhere.

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Paul
Paul on 15 Jul 2021
I tested stepplot and bodeplot and am seeing the same thing as you, i.e., if more than 7 responses, then multiple responses are linked together somehow and share the same color. Don't know why it's set up that way and couldn't find a way to change it, but as far as I can tell it's all undocumented behavior so can't really expect anything.
As a work around, you can use plain old bode() and step() and get the handles to the lines and change colors at will, so it seems to me.
  1 Comment
Stephen Reiman
Stephen Reiman on 15 Jul 2021
After poking around at the m-files as recommended I did settle on a solution.
I ended up implementing a color change per my original post for the 1st system and using the returns from bode, nichols, & nyquist with "line" for additional ones. Memory usage went down substantially.

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