ploting a file with variable name

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

Answer 1

[Knut]

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

[amir]

Thanks for note. That is right, I got the error (as you have shown above) saying that:

??? Error using ==> plot

Invalid first data argument

[Jan]

You can at least move the PLOT out of the EVAL:

plot(eval(fname))

Answer 2

[Jan]

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.