Missing something obvious? (fscanf)

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0 个投票

Trying to use fscanf to read data from a file that is 24 rows by 5 columns. I've set up this:

[fileId,errorMsg] = fopen('Data.txt', 'r');
if fileId < 0
    disp(errorMsg);
else
    NUMROWS = 24;
    for row = 1:NUMROWS
        for col = 1:5
            data(row,col) = fscanf(fileId, '%d', inf);
        end
    end
end

but I keep getting a "Subscripted assignment dimension mismatch." error when I run it. Not sure if I'm missing some obvious error or if I'm just doing this wrong to begin with.

Thanks very much for your help in advance.

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Ian Barker 2013-3-21

在 MATLAB Online 中打开

Not sure exactly what you mean by this. I have an example script which is quite similar to the code I posted and it runs fine, but for some reason when I tried the same thing with this file it did not work. BTW the file looks like this

    0.032    +170      1.5      -16.0
    0.034    +290      0.5       17.2
 0.214    -130      9.0       12.7
  0.263    -70       7.0       15.1
  0.275    -185      8.8       13.4
  0.275    -220      5.0       17.2
 0.45     +200      9.9       13.3
 0.5      +290      8.4       15.1
 0.5      +270      7.4       16.1
 0.63     +200      9.5       14.5
 0.8      +300     11.3       13.2
 0.9      -30       8.3       16.4
 0.9      +650      9.1       15.7
 0.9      +150      9.0       15.7
 0.9      +500     10.4       14.4
 1.0      +920      9.1       15.9
 1.1      +450      9.6       15.6
 1.1      +500     10.4       14.8
 1.4      +500      8.7       17.0
 1.7      +960     12.0       14.2
 2.0      +500     10.0       16.5
 2.0      +850      8.8       17.7
 2.0      +800      9.7       16.8
 2.0      +1090     9.5       17.0

Image Analyst 2013-3-21

Is the file text, or binary?

Ian Barker 2013-3-21

Just a standard text file.

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Answer 1

Cedric 2013-3-21

编辑：Cedric 2013-3-21

在 MATLAB Online 中打开

0 个投票

If you need to stick to FSCANF, you can do

 fid = fopen('Data.txt', 'r') ;
 data = fscanf(fid, '%f', [24, 5])
 fclose(fid) ;

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Ian Barker 2013-3-21

编辑：Ian Barker 2013-3-21

在 MATLAB Online 中打开

What I meant to say was that I get the correct array with the correct size and numbers but in a very wrong order. The data is supposed to be organized with each category of information being in one column, but after using fscanf it seems to read and order it in some weird way.

For example I want to get this as the top row:

1 0.032 +170 1.5 -16.0

but instead i get this:

1 13.4000 9.5000 500 1.7000

Ian Barker 2013-3-21

Aha I think i got it. Just had to change the %d in my earlier code to a %f and it magically works now.

Thanks alot for your help anyways.

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Answer 2

Image Analyst 2013-3-21

0 个投票

You can only assign one value to data(row,col) so why do you have inf instead of 1? Anyway, why don't you just use fread() to read the whole stream of data into a 2D array directly? Why use fscanf()?

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Ian Barker 2013-3-21

I'd love to use the many other easier ways of reading this file. But unfortunately I am being forced to use fscanf for some reason.

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Missing something obvious? (fscanf)

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