Plot and fill area enclosed by n lines using Octave\Matlab

Question

Lets suppose I have n curves, which together enclose some region. How to plot the curves and fill in the region they enclose using Octave/Matlab? Below is example for 3 curves (enclosed area is in black): enter image description here

You might need to be more specific - even one curve could enclose arbitrarily many regions, and there is no universally applicable algorithm to locate them. — James, Jan 10 '12 at 21:07

score 2 · Accepted Answer · answered Jan 10 '12 at 18:31

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You can use the function fill.

See the matlab documentation there:

http://www.mathworks.fr/help/techdoc/ref/fill.html

answered Jan 10 '12 at 18:31

Oli

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That is weird, I thought that he meant how to find the intersections of the lines. But (+1) anyway, since I did not know about **fill** – Andrey Rubshtein Jan 10 '12 at 19:31

score 0 · Answer 2 · edited May 23 '17 at 10:32

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I used the fill and flipr functions in matlab to shade the area between two curves:

fill( [x fliplr(x)],  [upper fliplr(lower)], 'c', 'EdgeColor','none'), where x = (1:100)

and 'upper' and 'lower' are variables representing my two traces.

I received help from this post: MATLAB, Filling in the area between two sets of data, lines in one figure

edited May 23 '17 at 10:32

Community

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answered Feb 25 '15 at 21:43

jack

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Plot and fill area enclosed by n lines using Octave\Matlab

2 Answers2