How do you vary 2D plot color with time when X and Y data overlap?

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Rob Moak
Rob Moak 2017-3-19
回答： Alain Kuchta 2017-3-22
I'm collecting data from some extensometers that show soil displacements in response to barometric pressure fluctuations. When the displacement data is plotted against the barometric data (to get a coefficient), the plot appears like a series of "squiggles" (see photo). When I use the patch() function, the polygons are filled in with color. I only want the color of the line to vary with time. Does anyone know how to accomplish this? I've tried surf(), but was unable to plot.
x = BaroP_Avg; % Barometric Pressure Data [kPa]
y = X8; % Displacement Data [microns]
col = time;
figure();patch(x,y,col);
Thanks, Rob
  1 个评论
Star Strider
Star Strider 2017-3-19
Guessing on this.
Consider plotting it in 3D with time on the ‘Z’ axis, and not using patch, at least at first. Then use the view function to rotate it to view it as 2D.
There may be other approaches.

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回答（1 个）

Alain Kuchta
Alain Kuchta 2017-3-22
I understand you would like to plot a 2D line of varying color. This MATLAB Answer suggests using surf to create the line:
https://www.mathworks.com/matlabcentral/answers/5042-how-do-i-vary-color-along-a-2d-line#answer_7057
Using the same technique, I was able to plot a line which "squiggles" back over itself and varies in color from start to finish. The one modification I made from the original post was to use "time" to vary color. The time is simply an array which increases from 1 to the number of samples.
x = [1 2 3 1 2 3];
y = [2 3 4 4 3 2];
z = zeros(size(x));
time = 1:length(x);
surface([x;x],[y;y],[z;z],[time;time],...
'facecol','no',...
'edgecol','interp',...
'linew',2);

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