ploting a file with variable name

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amir
amir on 3 Mar 2011
Hi,
I have some variables in my workspace: profile_01, profile_02,...,profile_09 they are vectors of let say size 100. now, i need to simply plot them. I would like to plot them in a 'for' loop since they are similar outputs. I have tried this: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% for PRFno=1:Ncomponent figure name= num2str(PRFno, 5); fname = ['profile_0',name] plot(fname(:,:),'-') end %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
however I got an error. Could you please help me with this? Cheers,Amir

Accepted Answer

Knut
Knut on 3 Mar 2011
If you use the {} Code tags, you will make the code a lot more readable for other users, and increase the chance that someone bothers to reply. I assume that this is representative for what you are doing and how MATLAB is responding?
profile_01 = zeros(100,1);
profile_02 = ones(100,1);
Ncomponent = 2;
for PRFno=1:Ncomponent
figure
name = num2str(PRFno, 5);
fname = ['profile_0',name]
plot(fname(:,:),'-')
end
>>
??? Error using ==> plot
Invalid first data argument
A possible work-around is to use eval, but I think that it is not the way to do things. Organizing the data in an array or cell array is probably neater. Anyways, here is something that seems to run:
profile_01 = zeros(100,1);
profile_02 = ones(100,1);
Ncomponent = 2;
for PRFno=1:Ncomponent
figure
name = num2str(PRFno, 5);
fname = ['profile_0',name]
eval(['plot(',fname,')'])
end
  2 Comments
Jan
Jan on 3 Mar 2011
You can at least move the PLOT out of the EVAL:
plot(eval(fname))

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More Answers (1)

Jan
Jan on 3 Mar 2011
The efficient and clean method would be to use indices as indices, instead of masking the index as part of the name:
profile_{1} = zeros(100,1);
profile_{2} = ones(100,1);
Ncomponent = 2;
for PRFno=1:Ncomponent
figure;
plot(profile_{PRFno});
end
I've used "profile_", because PROFILE is a Matlab command.

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