Run loop for multiple text files

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ashley
ashley on 27 May 2011
[EDIT: Fri May 27 04:38:19 UTC 2011 - Reformat - MKF]
I want to run a loop, then build a matrix for 8 data files. Error message: Undefined function or variable 'data'. keeps popping up. what do I do?
%Data for BrainZ sample_i, for i=1:8,
%[Data] -> [N' i] , 24(rows) by 2(col), for BrainZ sample_i, for i = 1:8
%col(1) = Region of Interest sample #, col(2) = mean density (tab delimited data)
%row = all measurements(1:24)
files = dir('*.txt');
for i=1:length(files)
load(files(i).name);
end
%Re-arrange [Data] to form new matrix [A]
%[A] -> [N" i] = 4(rows) by 6(col), of BrainZ sample_i, for i = 1:8
%row = measurement_h, for h = 1:4, from Region of Interest (ROI)
%col = ROI = [mU mM mL bU bM bL]
%Monoc Upper = mU, Monoc Middle = mM, Monoc Lower = mL, Bi Upper = bU, Bi Middle = bM, Bi Lower = bL
for n=1:1:size(data,1)
if n<=4
mU(n)=data(n,2);
elseif n>=5 && n<=8
mM(n)=data(n,2);
elseif n>=9 && n<=12
mL(n)=data(n,2);
elseif n>=13 && n<=16
bU(n)=data(n,2);
elseif n>=17 && n<=20
bM(n)=data(n,2);
elseif n>=21 && n<=24
bL(n)=data(n,2);
else
end;
end;
mU(mU == 0) = [];
mM(mM == 0) = [];
mL(mL == 0) = [];
bU(bU == 0) = [];
bM(bM == 0) = [];
bL(bL == 0) = [];
A = cat(2, mU', mM', mL', bU', bM', bL')

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Accepted Answer

Oleg Komarov
Oleg Komarov on 27 May 2011
data = cell(length(files));
for ii = 1:length(files)
data{ii} = load(files(ii).name);
end
data = cat(1,data{:});
  2 Comments
ashley
ashley on 27 May 2011
Thanks! How do I save matrix A for all eight files, then run the cat function to combine each A?
Oleg Komarov
Oleg Komarov on 27 May 2011
You should replace the snippet in your code.

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