Storing variables from an array loop
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Hello,
I'm coding to import several .txt files in matlab and create as many matrix as the number of file. I created the basic loop but I get stuck when it comes to store my dataArray without keeping overwriting it during the loop.
Here the code that I'm trying to work on to obtain new matrix in the workspace for each loop.
delimiter = '\t';
startRow = 2;
formatSpec = '%f%f%f%f%f%f%[^\n\r]';
for k = 1:3
% Read the file.
textFileName = ['SJ' num2str(k) '.txt'];
if exist(textFileName, 'file')
fid = fopen(textFileName, 'rt');
dataArray = textscan(fid, formatSpec, 'Delimiter', delimiter, 'EmptyValue' ,NaN,'HeaderLines' ,startRow-1, 'ReturnOnError', false);
fclose(fid);
else
fprintf('File %s does not exist.\n', textFileName);
end
%Create matrix
GRFdata = [dataArray{1:end-1}];
end
The issue is that GRFdata keeps overwriting whilst I would obtain GRFdata1, GRFdata2, etc.
Anyone could point me out the right way to proceed, please? Thanks
4 个评论
per isakson
2015-1-16
See 'CollectOutput' of textscan
Giuseppe
2015-1-16
Stephen23
2015-1-17
Basically you should not do this. Using dynamically defined variable names or encoding data within the variable name is a pretty bad idea in MATLAB, as is described on many threads on MATLAB Answers:
The first of these links gives an excellent alternative, which is what you should probably be using for your data: structures . In particular you can dynamically assign the field names, which is a much neater solution than dynamically defining variable names.
Giuseppe
2015-1-17
采纳的回答
While you can dynamically create variable names on the fly, it's almost never a good idea. You lose syntax checking, compiler optimisation, ease of debugging, ease of understanding the code, etc.
The best way is to store your various matrices in a cell array:
GRFdata{k} = [dataArray{1:end-1}];
Referring to these matrices afterward is simply:
m = GRFdata{n}; %replace n by the index of the matrix you want to use
If you really want to use different variable names, use eval:
eval(sprintf('GRFdata%d = [dataArray{1:end-1}]', k)); %eugh!
Accessing these matrices is then:
m = eval(sprintf('GRFdata%d', n)); %eugh!
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