# how to do plotting with different colors in same figure?

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Ved on 6 Nov 2013
Answered: Da Bu on 22 Apr 2021
My sample code is this:
x=[1:100];
for i=1:5
y(:,i)=i*log(x);
end
This plots 5 different curves of same color.
How to plot each curve with a different color ?
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Image Analyst on 2 Mar 2017
This is not a comment so you should put it with the rest of the "Answers" below (so you could get "reputation points" for it if someone "Votes" for it).

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### Accepted Answer

Simon on 6 Nov 2013
Hi!
If you plot like
plot(x,y)
and y is a matrix, you get plots with different color automatically. But you can do something like this to get manual coloring:
colorstring = 'kbgry';
figure(1); cla;
hold on
for i = 1:5
plot(x,y(:, i), 'Color', colorstring(i))
end
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Simon on 11 Nov 2013
Hi!
Of course you have to define a usable colorspec. Take a look at http://en.wikipedia.org/wiki/RAL_colour_standard and follow the links there. There are many colors with their RGB values. Mind that matlab uses RGB values between 0 and 1, and not between 0 and 255!

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### More Answers (7)

Kelly Kearney on 6 Nov 2013
Also, using colormaps and set with multiple handles + cell arrays can be helpful if you need a lot of colors.
x = 1:100;
ii = (1:20)';
y = ii*log(x);
h = plot(x,y);
set(h, {'color'}, num2cell(jet(length(ii)), 2));
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Saksham Gakhar on 19 Apr 2021
thank you!

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Image Analyst on 6 Nov 2013
Simon showed you how to specify custom colors for each curve. If you want to know how to change the default color order, see my demo attached below.
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Ved on 10 Nov 2013
thank you Image Analyst.

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PeopleMATLAB on 13 Oct 2016
colormap jet;
cmap=colormap;
for i=1:5
Plot_color=cmap(i/5,:);
plot(x, y(i,:), 'Color', Plot_color);
hold on;
end
hold off;
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C S on 11 Jul 2018
just use i*5 and you are okay

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farhat khan on 19 Jul 2019
gys i have a question ..... how to detect the object with color based detection if the required object have more then one color e.g green and black ..........
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Image Analyst on 19 Jul 2019
I don't beleive you can plot a single set of data with two colors and one call to plot (plotyy notwithstanding). You have to keep track of the handle of the things you plotted:
hGreen = plot(x1, y1, 'g-'); % Plot a green line.
hBlack = plot(x2, y2, 'k-'); % Plot a black line.
I'm not sure how you'd detect what the color was if you didn't save the handle to the colored line you plotted, but maybe there is a way by using findobj() and seeing if you can get the color of any line object as a property. It's certainly not as straightforward so I recommend you just save the handles to the colors of the lines you drew, if you plan to detect them later.

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SYAHIRAH ZAKI on 7 Dec 2020
hi does anoyne know how to get different plot colors for each of my graph?
if i change the 'r' to 'g', i only get one color for each of my graph. I need each of my plot in different colour. please help me :(
% Script file graph2.
% Several plots of the rational function y = x/(1+x^2)
% in the same window.
k = 0;
for n=1:3:10
n10 = 10*n;
x = linspace(-2,2,n10);
y = x./(1+x.^2);
k = k+1;
subplot(2,2,k)
plot(x,y,'r')
title(sprintf('Graph %g. Plot based upon n = %g points.' ...
, k, n10))
xlabel('x')
ylabel('y')
axis([-2,2,-.8,.8])
grid
pause(3);
end
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Edited: Korosh Agha Mohammad Ghasemi on 7 Dec 2020
%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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Da Bu on 22 Apr 2021
for a small set of colors, you can use ColorOrderIndex
t=1:0.1:2*pi;
for i=1:5
plot(t,sin(t)*i), hold on
ax = gca;
ax.ColorOrderIndex = i;
end
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