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

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M G
M G on 17 Mar 2011
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
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;
plot(t,z1,'b',t,z2,'r')
And while I'm here, I might as well peddle my wares: http://www.mathworks.com/matlabcentral/fileexchange/30423-conditionally-colored-line-plot

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More Answers (1)

Korosh Agha Mohammad Ghasemi
%https://zil.ink/korosh -------- Ways to contact me ----------
% Korosh Agha Mohammad Ghasemi !
% Chemical Engineering at Shiraz University
x=linspace(0,2,100);
figure;
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
y=x.^a;
plot(x,y,'k') %Now choose the color
hold on
elseif a == 0.5
y=x.^a;
plot(x,y,'b') %Now choose the color
hold on
elseif a==1
y=x.^a;
plot(x,y,'g') %Now choose the color
hold on
elseif a==2
y=x.^a;
plot(x,y,'r') %Now choose the color
hold on
elseif a==4
y=x.^a;
plot(x,y,'y') %Now choose the color
hold on
grid on
end
end

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