While running simulation, plot each curve with a different color

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hibou
hibou 2014-7-22
编辑： hibou 2014-7-23
Hi all, I saw many thread on the same question but I guess I don't understand how it works. I want to get different possibilities for the phi matrix so I'm running simul and want a plot with all the curves with a different color. I don't know if the problem come from where I put the plot and hold on but would really appreciate some help ! This is a MWE.
{
nb=[];
total=[];
con=[];
nbcon=[];
simul=[];
hold all
for simul=1:5
phi=zeros(4,4);
for nbIter=1:30
Nel = numel(phi);
Rindices = randperm(Nel);
N10 = floor(Nel/10);
phi(Rindices(1:N10)) = 1
nbcon=sum(sum(phi))
nb=sum(sum(phi))*rand(1);
con=[con; nb, nbcon];
end
plot(con(:,2),con(:,1),'color', rand(1,3))
end
hold off

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采纳的回答

Geoff Hayes
Geoff Hayes 2014-7-22
The problem is that the code is plotting all the data at each iteration, including that which was plotted at previous iterations. So all points are being overwritten with the new random colour.
Just reset con to the empty matrix on each iteration of the outer for loop, that way the code doesn't hang on to the legacy data from previous iterations
for simul=1:5
phi=zeros(4,4);
con = []; % new line of code to add
% etc.
Try the above and see what happens!
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Geoff Hayes
Geoff Hayes 2014-7-22
Just create a figure and add hold on after it to retain the current graph when adding new graphs. Replace the
hold all
with
figure;
hold on;
Joseph Cheng
Joseph Cheng 2014-7-22
Perhaps use a colormap to get the color to get some distinct colors to plot.
Linecolor = hsv(numberoflines);
in the held plot
plot(con(iteration,2),con(iteration,1),'color', Linecolor(iteration,:))

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更多回答（1 个）

hibou
hibou 2014-7-23
编辑：hibou 2014-7-23
Geoff and Joseph, thanks for your help ! I really couldn't get where and when use the hold on command. The answer by Geoff Hayes pointed me that I had to delete the con matrix at the outer loop and Joseph Cheng helped me set up the plot colors. And here is a simple way for different color curve:
clc
close all
clear all
nb=[];
total=[];
con=[];
nbcon=[];
simul=[];
for simul=1:5
phi=zeros(4,4);
for nbIter=1:30
Nel = numel(phi);
Rindices = randperm(Nel);
N10 = floor(Nel/10);
phi(Rindices(1:N10)) = 1
nbcon=sum(sum(phi))
nb=sum(sum(phi))*rand(1);
con=[con; nb, nbcon]
end
hold on
Linecolor = hsv(5);
plot(con(:,2),con(:,1),'color', Linecolor(simul,:))
con=[];
end
hold off
Thanks a lot !!

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