Graph colouring

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old_user_rat
old_user_rat 2012-4-17
Dear all,
I have the following 2d plot. I would like to colour/shade the regions of the graph in the same way you would use the colour fill for shapes in a basic paint program. Is there an easy way to do this with code or in the plot editor?
Thanks, David
p=0:0.001:0.25;
y3=(p + (1 - 4*p).^(1/2)/2).^2/2;
plot(p,y3,'black')
hold all
y5=(1/2)*(p+(1/2)*(1-4*p).^(1/2)).^2;
plot(p,y5,'black')
hold all
p=0:0.001:0.5;
y1=2*p.^2;
plot(p,y1,'black')
hold all
y7=p.^2;
plot(p,y7,'black')
hold all
y2=(p-1/2).^2;
plot(p,y2,'black')
hold all
vline([((2)^(1/2)-1)/2,1/4],'black')

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回答（1 个）

Thomas
Thomas 2012-4-17
One way: You could try an area plot with different colors and a transparency
p=0:0.001:0.25;
y3=(p + (1 - 4*p).^(1/2)/2).^2/2;
area(p,y3,'FaceColor','blue')
hold all
y5=(1/2)*(p+(1/2)*(1-4*p).^(1/2)).^2;
area(p,y5,'FaceColor','green')
hold all
p=0:0.001:0.5;
y1=2*p.^2;
area(p,y1,'FaceColor','red')
hold all
y7=p.^2;
area(p,y7,'FaceColor','cyan')
hold all
y2=(p-1/2).^2;
area(p,y2,'FaceColor','yellow')
hold all
alpha(0.5)
vline([((2)^(1/2)-1)/2,1/4],'black')

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