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- fill_between used to just plot the fill, but now is additionally
plots the x,y1 and x,y2 lines so you don’t have to do this manually.
- handles are returned, so you can access all their properties. For
examples, it is easy to remove the lines by setting their visibility to
‘off’.
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README.md

fill_between.m

A Matlab function to fill selected areas in plots. This function was inspired by a function with the same name in the Python library, Matplotlib.

The function has the following arguments:

[y1handle, y2handle, h] = fill_between(x,y1,y2, where, opts);
  • x is a vector of x locations
  • y1 and y2 are vectors of y locations
  • where is any binary vector specifying the conditions under which the regions between y1 and y2 will be filled. This is a nice property as we can plot a curve, and decide to only fill a particular region of that curve (see top left in figure below).
    • if where=1 or where=[] then we assume we want to fill all of the x values given (see the top right example).
    • y1 and y2 can both be vectors, in which case we will fill between then (see top right, and bottom left examples).
    • y1 or y2 (but not both) can be constants, and we just fill up to a particular y baseline see bottom right example.
  • opts is a cell array of patch properties which will be applied to the fill.

Functionality is demonstrated with the file demo_plot.m

But here is a snippet for the top left example:

x = linspace(-pi,pi,200);
y = sin(x*4);

fill_between(x, y, 0, x>0 & x<pi/2, 'EdgeColor', 'none', 'FaceColor', [0.5 0.5 1]);

If you'd like to improve the functionality, please do feel free to create a branch and submit a pull request.

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A Matlab function to fill selected areas in plots

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