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cell array

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huda nawaf
huda nawaf 2011-11-27
关闭： MATLAB Answer Bot 2021-8-20
I have file :
2 3 5 7
10 12 0 1 1
3 41 23 1000 1 11 4 11
1 10 2
I want place this values in cell array
how do that?
thanks
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Sven
Sven 2011-11-27
Huda, just a general piece of advice. It seems at the moment you are in the learning stages of MATLAB. That's fine, there's nothing wrong with that.
On one previous question you asked "how do I save a sparse matrix to a text file", and it turned out that you didn't need to use "sparse" *or* use a text file.
In this case you are asking how to store a sequence of numbers into a cell array. From your initial question (and as Image Analyst has asked), it seems that you don't *need* to use a cell array, as that would only complicate things.
Here's my suggestion: try to describe very clearly *what you have*, *what you are trying to do*, and *why*. I have a feeling (from your previous questions) that if you can describe these things clearly, you might get some very good answers that will show you the best way how to do it and help you learn much faster.
In this question we don't quite know *what you have* (see Fangjun's question) or *why* you're trying to store to a cell when a matrix would be more appropriate.
huda nawaf
huda nawaf 2011-11-27
I want use cell array in order to avoid insert zeroes in array, because each row in my file with different length.
I do all that to avoid out of memoery
the above data is just example ,my data is very huge.
thnaks

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回答（1 个）

Walter Roberson
Walter Roberson 2011-11-27
YourCell = {};
fid = fopen('YourFile.txt','rt');
numrows = 0;
while true
thisline = fgetl(fid);
if ~ischar(thisline); break; end %end of file
numrows = numrows + 1;
YourCell{numrows} = sscanf(thisline, '%g');
end
fclose(fid);
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Image Analyst
Image Analyst 2011-11-27
Not exactly, but just because the sscanf args are reversed. Either of these two would work though:
% Method 1
YourCell(numrows) = {sscanf(thisline, '%g')};
% Method 2
YourCell{numrows} = sscanf(thisline, '%g');
As far as I can tell, they're the same. But it's this just kind of brace/parentheses confusion that is confusing to beginners.
Walter Roberson
Walter Roberson 2011-11-28
Thanks, code adjusted to remove errors.

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