Using plot command in a loop

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Yasmin Tamimi
Yasmin Tamimi 2012-10-19
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 个评论
Azzi Abdelmalek
Azzi Abdelmalek 2012-10-19
you are trrying to plot a string. What data do you want to plot?

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采纳的回答

Pedro Villena
Pedro Villena 2012-10-19
编辑：Pedro Villena 2012-11-8
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

更多回答（2 个）

MANJUNATH
MANJUNATH 2012-10-19
try using string to num conversion
Robert Cumming
Robert Cumming 2012-10-20
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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