importdata skips the last few rows?

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Sam 2012-5-9

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Hello all. I was using importdata in my code to bring in some matrices. I hadn't tested the code in quite some time, but I just upgraded from r2011a to r2012a and then ran it. Apparently importdata is now misbehaving. Whenever I try to do

>> data = importdata('file.txt')

where file.txt is a 360x720 ASCII file (generated from Matlab a while back using

>> save('file.txt','variable','-ASCII')

I get a variable that is 348x720:

>> size(data)
ans =
   348   720

This happens with other 360x720 ASCII files as well, although for some of them I only get 347 rows. What do you think is going on? Thanks in advance!

PS: Here is a link to an example 'file.txt' this happens with.

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Sam 2012-5-9

I deleted r2011a after installing r2012a so I can't be sure at this point, but I certainly never ran into this issue when using r2011a before.

Sam 2012-5-9

Also, no, there are no empty lines or anything that I can see using a text editor.

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采纳的回答

Geoff 2012-5-9

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在 MATLAB Online 中打开

That's odd... Confirmed in my own 2012a.

It appears to be trimming all the entirely NaN rows from the end of your data.

I replaced line 348 with line 349, and confirmed the result is 347 rows long. Then I set the first element in line 360 to a non-nan value, and the result was 360 rows long.

I think this is stupid behaviour to have in a function, but nevermind.

Given that the files were created with save, you should do this instead:

data = load('file.txt', '-ASCII');

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Geoff 2012-5-9

@Jan : Oh, I had a look and found this:

if ~isempty(numericData)

numericData = TrimTrailing(@(x)(isnan(x)), numericData);

end

Sam 2012-5-10

Geoff, using "load" as you suggest does the trick. I will be submitting a bug report… I think that at the very least that behavior in "importdata" needs to be documented and optional. Thanks for your help!

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