Missing something obvious? (fscanf)

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.

[Cedric]

Could you copy/paste this file here as a comment? The FSCANF won't work a priori, and I guess that we should discuss the approach.

If you do the following, you should see that it cannot work

 >> [fileId,errorMsg] = fopen('Data.txt', 'r') ;
 >> fscanf(fileId, '%d', inf)
 ans = 
     .. whatever you'll get
 >> fscanf(fileId, '%d', inf)
 ans =
     .. and here it should start not to return what you want ..
 >> fscanf(fileId, '%d', inf)
 ans =
     .. and again ..
 >> fscanf(fileId, '%d', inf)
 ans =
     .. and again ..
 ...

[Ian Barker]

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

1      0.032    +170      1.5      -16.0
2      0.034    +290      0.5       17.2
6822   0.214    -130      9.0       12.7
598    0.263    -70       7.0       15.1
221    0.275    -185      8.8       13.4
224    0.275    -220      5.0       17.2
5457   0.45     +200      9.9       13.3
4736   0.5      +290      8.4       15.1
5194   0.5      +270      7.4       16.1
4449   0.63     +200      9.5       14.5
4214   0.8      +300     11.3       13.2
3031   0.9      -30       8.3       16.4
3627   0.9      +650      9.1       15.7
4826   0.9      +150      9.0       15.7
5236   0.9      +500     10.4       14.4
1068   1.0      +920      9.1       15.9
5055   1.1      +450      9.6       15.6
7331   1.1      +500     10.4       14.8
4258   1.4      +500      8.7       17.0
4151   1.7      +960     12.0       14.2
4382   2.0      +500     10.0       16.5
4472   2.0      +850      8.8       17.7
4486   2.0      +800      9.7       16.8
4649   2.0      +1090     9.5       17.0

[Image Analyst]

Is the file text, or binary?

[Ian Barker]

Just a standard text file.

Answer 1

[Cedric]

If you need to stick to FSCANF, you can do

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

[Ian Barker]

That works, but the problem is the data is then so jumbled up I can't index it later. Unless there is some way to reorganize it instead of having the output as line by line?

Thanks for helping.

[Cedric]

On my system I get a 24x5 numeric array, as specified by the 3rd argument of FSCANF. Did you keep Inf as a 3rd arg? If not, which version of MATLAB are you using?

If you get a 120x1 array, you can reshape it the following way

 data = reshape(data, 5, []).' ;

[Ian Barker]

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]

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.

Answer 2

[Image Analyst]

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()?

[Ian Barker]

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.