Re: Why is my data not being read correctly?

[Doug Stewart]

On Wed, Feb 6, 2013 at 10:01 PM, Terry Duell <address@hidden> wrote:

Hello All,
Perhaps I should rephrase the subject line...why is my data not being read as I expect it to be?
I am using fscanf to read data from a file. The problem is that once I have read the first 3 lines (header), the first data entry appears to be skipped.
The header appears to read OK, as the the correct number of reads is known.
The following script displays the issue.

%read data file
fp1 = fopen("test_data.txt","r")
name1 = fscanf(fp1,"%s \n","C")
junk1 = fgets(fp1,128) % use fgets with a max, then no need for str len
[num1 spac1] = fscanf(fp1,"%6f%6f\n","C")
dat = zeros(2,num1);
% check what we have
name1
num1, spac1
% read
for i = 1:num1
        dat(1,i) = (i-1)*spac1;
        dat(2,i) = fscanf(fp1,"%f \n","C");
end
fclose(fp1);
dat

The data file ('test_data.txt') has been doctored, with an extra data item added at the end to prevent an error. The data file is follows...

NAME
Descriptor stuff
 9 7.55
   59.80
   59.80
   60.51
   59.80
   59.80
   59.37
   59.06
   58.94
   59.02
   44.11

and the response I get here from Octave 3.6.3 is as follows...

fp1 =  3
name1 = NAME
junk1 = Descriptor stuff

num1 =  9
spac1 =  7.5500
name1 = NAME
num1 =  9
spac1 =  7.5500
dat =

    0.00000    7.55000   15.10000   22.65000   30.20000   37.75000   45.30000   52.85000   60.40000
   59.80000   60.51000   59.80000   59.80000   59.37000   59.06000   58.94000   59.02000   44.11000

I'm not very familiar with C, so it is possible that my method of reading the data is flawed, but thus far I haven't been able to see why the script is behaving as it is.

Can anyone see why the first data item (the first 59.80) isn't being read?

Cheers,
--
Regards,
Terry Duell
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try line 6 like this.

[num1 spac1] = fscanf(fp1,"%6f%6f","C")

--

DAS

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