MATLAB: Line graph shading

line graphshadeshading

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

Best Answer

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)

Related Solutions

MATLAB: How can i fill the common areas of two curves

Another possible solution:

y1 = @(x) 3*x.^2 + 2*x +1;
y2 = @(x) -5*x.^2 + x + 20;
x = -5:0.1:5;
pgon1 = polyshape(x,y1(x));
pgon2 = polyshape(x,y2(x));
figure
plot(x,y1(x),x,y2(x))
hold on
plot(intersect(pgon1,pgon2),'EdgeColor','none')

MATLAB: How to generate random points in a line

For each line (edge) of the polyhedron you can write it's equation as

(y - y1) = (y1 - y2)(x - x1)/(x1 - x2)

So in case of edge from vertex (0, 2) to (1, 0) you can generate it as -

x = (1 - 0) * rand(n,1) + 0 ;  %(x2-x1)*(n random number)+x1
y = (2 - 0)/(0 - 1) * (x - 0) + 2 ; % (y1-y2)/(x1-x2)*(x-x1) + y1

Here 'n' is the number points you need to generate on the edge. You can do it for each pair of adjacent vertices in a loop.

Best Answer

Related Solutions

MATLAB: How can i fill the common areas of two curves

MATLAB: How to generate random points in a line

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