# How to use loop for plotting multiple plots and legend?

6 views (last 30 days)
Arshey Dhangekar on 25 Aug 2022
Commented: Dyuman Joshi on 12 Sep 2022
I want to plots mulplits plots on and I have single x time axis and temp1 upto temp20 similalry so how to use loop here for labeling the legend and plots instead of writing for 20 times.
plot (t.time,t.temp1, .t.time,temp20)
legend ("Temp1",....,"Temp2")

Dyuman Joshi on 25 Aug 2022
What you want to do is possible but quite more tedious than what you did.
z=cell(1,20);
for i=1:20
z{i}=sprintf('temp%d', i); %collecting legend labels in a cell array
plot(table2array(y(:,'Time')),table2array(y(:,z{i})))
hold on
end
hold off
legend(z,'Location', 'best','FontSize',6 , 'NumColumns',4)

Arshey Dhangekar on 1 Sep 2022

How to vary colors because it's difficult to identify the parameters. Any suggestions

Dyuman Joshi on 12 Sep 2022
You can use rand() (which I guess is the default option as well) to obtain different colors. Though there's a chance that 2 or more colors seem similar, for eg -
x=0:0.01:10;
for i=1:20
plot(x,sin(x).^i,'Color',rand(1,3))
z{i}=sprintf('sin^{%d} x', i);
hold on
end
legend(z,'Location', 'best','FontSize',6 , 'NumColumns',4)
%11-13, 16-18 look similar
Or you can define particular array for it, to distinguish better in between colors.
A random example -
y = (dec2base(0:19,3)-'0')/2;
figure
for i=1:20
plot(x,cos(x).^i,'Color',y(i,:))
z{i}=sprintf('cos^{%d} x', i);
hold on
end
legend(z,'Location', 'best','FontSize',6 , 'NumColumns',4)

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