Line graph shading?

2011 11 9
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Hi,
I have a line graph with quite a few different lines drawn it. I want to shade regions between a couple of the lines to represent/highlight the area. Is there a function or a method i can use to do such a thing?
Cheers for any help given in advance Regards Rob

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Daniel Shub
Daniel Shub 2011-11-9

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The fill command can do this. It requires some careful control of the ordering of the points and the ordering of the lines (hence the fliplr in the example below) ...
doc fill
x = 1:10;
y1 = 1:10;
y2 = 2:11;
h = fill([x, fliplr(x)], [y1, fliplr(y2)], 'r')
You can make it transparent with
set(h, 'FaceAlpha', 0.5)

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Rob Ing
Rob Ing 2011-11-9
This does the trick just nicely.
Just to make it slightly clearer to others, as it took me a good 15-20 mins to figure out exactly what was going on. The fill() uses coordinates. So to make a 10x10 box....
Coordinates in terms x,y....(0,0),(10,0),(10,10),(0,10),(0,0)
x = [0,10,10,0,0]
y = [0,0,10,10,0]
h = fill(x,y, 'r')
Cheers for the help!! Much appreciated.

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Fangjun Jiang
Fangjun Jiang 2011-11-9

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I am not aware of any function for it. If you can get the intersection points, or just define the points, you can use patch().

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Rob Ing
Rob Ing 2011-11-9
Cheers for attempting to help but i found my answer in Daniel's answer.

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