Plot Multiple Colours automatically in a for loop

Question

Robbie 2012-1-11

1
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https://ww2.mathworks.cn/matlabcentral/answers/25831-plot-multiple-colours-automatically-in-a-for-loop

回答： Korosh Agha Mohammad Ghasemi 2020-12-7

Hi,

I am trying to plot a graph, with a different colour being used automatically for each line on the plot, is there a simple way to do this? Here is my code:

% Define a range of y values
y = [0:0.01:1];
hold on
% Create a loop, which calculates the velocity profile for each a_0
% coefficient in the range 0 => 2.67 with 0.267 increments:
for a_0 = [0:0.267:2.67];
      for i = 1:length(y)
          % Define boundary layer thickness delta as 99% U_inf
          delta = 0.99;
          % Define eta as a function of y position and the constant delta:
          eta(i) = y(i)./delta;
          % Calculate the velocity profile:
          u_prof(i) = (a_0.*eta(i)) - ((((3./2).*a_0)-2).*(eta(i).^2)) - ((1- (a_0./2)).*(eta(i).^4));
      end
      % Plot the velocity profile for each a_0 coefficient
      plot (u_prof,y)
      grid on
end
hold off

Thanks,

Robbie

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Answer 1

Chandra Kurniawan 2012-1-11

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You should replace line

plot (u_prof,y)

with

plot (u_prof,y,'color',rand(1,3))

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Rajan Kumar 2014-4-25

编辑：Rajan Kumar 2014-4-25

Why (1,3) can it be any other number?

Ilham Hardy 2014-4-25

No it can't.

To resembles the rgb input (1x3 matrix)

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Answer 2

C.J. Harris 2012-1-11

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I would suggest taking a look at the 'hold all' command. Just replace the line:

hold on

with:

hold all

That way you won't have to make any other modifications to your code.

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Dili Sam 2012-11-12

THANKS IT WAS USEFUL FOR ME TOO... SAVED MY TIME!!

Taha Alian 2015-3-27

Excelent

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Answer 3

Korosh Agha Mohammad Ghasemi 2020-12-7

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此回答的直接链接

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%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