How can I save a series of variables in workspace to a txt file?
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Marty Dutch
on 3 Oct 2013
Commented: Marty Dutch
on 4 Oct 2013
Hi all,
I want to save a bunch of variables (data1, data2 etc) to a textfile (alldata.txt). The code below is a simplified version but it makes the problem clear, since the saved data in the textfile is not correct.
data1 = 1
data2 = 2
data7 = 3
data10 = 5
for i = 1:10
try
fid = fopen('alldata.txt','w');
x = (sprintf('data%d', i));
fprintf(fid,'%d\n',x);
fclose(fid);
catch
continue;
end
end
Tthis is the output in alldata.txt, which is wrong:
100
97
116
97
49
48
Is there anybody who can help me?
ps. I dont want to make use of the option: save() with the -ascii flag, because I want to be able to do some text formatting.
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More Answers (1)
dpb
on 3 Oct 2013
data1 = 1;
data2 = 2;
data7 = 3;
data10 = 5;
Don't do this; as you've discovered "there be dragons". Use
data=zeros(10,1); % set size as needed...
data(1)=1;
data(2) = 2;
data(7) = 3;
data(10) = 5;
instead. Then write the array members desired.
Or, of course, if there are a large number of missing indices, you can use named fields in a structure to provide specific ones instead of a full array.
Matlab works best if you don't try to create such named variables as you show initially--falling into the (common; don't think you're the only/first with the above idea) trap above is counterproductive in almost every case.
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