Matlab code but i'm having problems puting in a loop

[manicwhite]

Hi. i have seen similar questions on here but can't quite get them to apply to my problem

i have wrote some MATLAB code but I'm having problems puting in a loop

heres my code
-----------------------------------------------------------------------------------------

clear
clc
for i=1:10
name=['C:\Documents and Settings\john\My Documents\matlabfiles\t2\p',num2str(i),'t2a.asc'];
load(name);

end
clear name

track1=findvarible(p1t2a,31);
track2=findvarible(p2t2a,31);
track3=findvarible(p3t2a,31);
track4=findvarible(p4t2a,31);
track5=findvarible(p5t2a,31);
track6=findvarible(p6t2a,31);
track7=findvarible(p7t2a,31);
track8=findvarible(p8t2a,31);
track9=findvarible(p9t2a,31);
track10=findvarible(p10t2a,31);
--------------------------------------------------------------------------------
i would like to put the last block into a loop

the files pit2a are arays of varying size (x,66). i want to take one column of interest out
i have tried puting these values into an aray 'track' like this.

---------------------------------------------------------------------------
% track=zeros(85,66)
% for i=1:10
% track(:,i)=findvarible(eval(['p',int2str(i),'t4a']),31);
% end
--------------------------------------------------------------------------
this caused me problems because the variables were of different sizes so i tried pre defining the aray to the biggest varible but that didnt work


the function findvarible is(see below). its in there for an adition i intend to add later
-------------------------------------------------------------------
function [ varible ] = findvarible( filename,var )
varible=filename(:,var);
end
--------------------------------------------------------------------

i have tried using a lop to do it like the top bit automaticaly but i just can't get it to work.


so anyways. any help that puts me in the right direction to geting that top block into a loop would be helpfull

hope that wasnt to wishywashy

 

[manicwhite]

tried this

%track(:,1)=p1t4a(:,31);% this line checks it can work works

for i=1:10
name=['p',int2str(i),'t4a']
track(:,i)=name(:,31)
end
got this error

? Index exceeds matrix dimensions.

Error in ==> test4compare at 14
track(:,i)=name(:,31)

 

[manicwhite]

i think i already mentioned something similar to this

for i=1:10
name=['p',int2str(i),'t4a']
track(:,i)=eval(['p',int2str(i),'t4a(:,31)'])
end

the first one runs then i get an error saying
? Subscripted assignment dimension mismatch.

Error in ==> test4compare at 14
track(:,i)=eval(['p',int2str(i),'t4a(:,31)'])

 

[manicwhite]

for i=1:10
name=['p',int2str(i),'t4a']
eval(['track', int2str(i) '=p',int2str(i),'t4a(:,31)'])
end

ok i have a working loop. i am happy. if you have a better solution to the problem please still post

 

[DeeNos]

Hi there,

It seems like you are having trouble putting your code into a loop because the variables you are trying to loop through are of different sizes. One solution could be to predefine the array 'track' to be the size of the largest variable, and then use a conditional statement within the loop to only add the column of interest if it exists in the current variable.

For example:

track = zeros(max_size, 66); % predefine track to be the size of the largest variable

for i = 1:10
name = ['C:\Documents and Settings\john\My Documents\matlabfiles\t2\p',num2str(i),'t2a.asc'];
load(name);

% use a conditional statement to only add the column if it exists in the current variable
if size(pit2a, 2) >= 31
track(:,i) = findvarible(pit2a, 31);
end
end

This way, the loop will only add the column to 'track' if it exists in the current variable, and the rest of the columns will remain as zeros.

I hope this helps and puts you on the right track. Let me know if you have any further questions or if this solution doesn't work for you. Good luck with your code!