Using plot command in a loop

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Yasmin Tamimi
Yasmin Tamimi on 19 Oct 2012
Hey All,
I tried to change the input argument for plot command but it didn't work as I discovered that plot doesn't accept it as an input argument:
for i= 1:20
figure, plot((sprintf('Data%d',i))) , hold on; plot(f_mean*ones(length(sprintf('Data%d',i)),1),'r'); plot(sprintf('alpha_data%d',i),'g'); plot(sprintf('alpha_data_neg%d',i),'g'); hold off; axis ([0 350 0.28 0.32])
end
What can I change in my code to make it work??
  1 Comment
Azzi Abdelmalek
Azzi Abdelmalek on 19 Oct 2012
you are trrying to plot a string. What data do you want to plot?

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Accepted Answer

Pedro Villena
Pedro Villena on 19 Oct 2012
Edited: Pedro Villena on 8 Nov 2012
if you want to change the variable name in the loop, use eval command
for i= 1:20,
figure(i),
eval(sprintf('plot(Data%d)',i));
hold on;
eval(sprintf('plot(f_mean*ones(1,length(Data%d)),''r'')',i));
eval(sprintf('plot(alpha_data%d,''g'')',i));
eval(sprintf('plot(alpha_data_neg%d,''g'')',i));
hold off;
axis ([0 350 0.28 0.32])
end

More Answers (2)

MANJUNATH
MANJUNATH on 19 Oct 2012
try using string to num conversion

Robert Cumming
Robert Cumming on 20 Oct 2012
using eval is almost always a bad idea. Store your data as
Data(1), Data(2) etc..... rather than Data1, Data2 etc....
If you end up needing to use eval to solve your problem your looking in the wrong area for a solution.
Why should you not use it:
1. Its hard to debug 2. Its very slow.
Have a look at Matlabs Loren telling you why to avoid eval here and here

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