Line graph shading?

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

Answer 1

[Daniel Shub]

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)

[Rob Ing]

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.

Answer 2

[Fangjun Jiang]

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().

[Rob Ing]

Cheers for attempting to help but i found my answer in Daniel's answer.