How to change the color of a graph only in a particular section?

72 views (last 30 days)
Hey all,
I was just wondering if there is a way to change a particular part of a plot to another color? Suppose we have a plotted signal in BLUE and we wannan show the main response (let's say with the highest amplitude) in RED.

Accepted Answer

Jan on 17 Mar 2011
You can draw different lines.
t = 0:0.02:4*pi;
y = sin(t);
index = (y >= 0);
plot(t, y, 'b');
plot(t(index), y(index), 'r');
  1 Comment
Matt Tearle
Matt Tearle on 22 Mar 2011
A nice trick to remove points graphically is to set them to NaN. Eg
t = 0:0.02:4*pi;
y = sin(t);
z1 = y;
z1(y>=0) = NaN;
z2 = y;
z2(y<0) = NaN;
And while I'm here, I might as well peddle my wares:

Sign in to comment.

More Answers (1)

Korosh Agha Mohammad Ghasemi
% -------- Ways to contact me ----------
% Korosh Agha Mohammad Ghasemi !
% Chemical Engineering at Shiraz University
for a=[0.1 0.5 1 2 4]
y=x.^a; %The function is hypothetical
if a == 0.1 %Any color can be substituted
plot(x,y,'k') %Now choose the color
hold on
elseif a == 0.5
plot(x,y,'b') %Now choose the color
hold on
elseif a==1
plot(x,y,'g') %Now choose the color
hold on
elseif a==2
plot(x,y,'r') %Now choose the color
hold on
elseif a==4
plot(x,y,'y') %Now choose the color
hold on
grid on


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!