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Re: Reading tab-delimited ASCII files


From: James Sherman Jr.
Subject: Re: Reading tab-delimited ASCII files
Date: Tue, 7 Aug 2007 16:11:29 -0400

Well, I can't attest to it being any faster, but something like
[v1, v2, v3, v4] = fscanf(fid, "%s%s%s%s", 'Inf')
Would give you an already parsed line with v1 being the first column in the line, and so on.  v[1-4] are still strings though, so doing some simple strcmp calls to check if the string is a N/A or an actually number to sort out the rest.

Hope this helps.

James Sherman

On 8/7/07, Matthias Brennwald <address@hidden> wrote:
Dear all

I've got some ASCII file containing data which I'd like to read into
Octave. The ASCII files contain several lines and columns. The columns
are separated by tabs. The first column contains strings or variable
width (parameter names), the remaining columns contain mostly numbers
and some NaN values (e.g. 'N/A'). As an example, a file might look like
this:

K_G     1E-2    N/A     0.1
KD_FIN  2       1.9     1.8
KD_COA  0.2     0.02    1.2E-2
T_LI    9.3244  8.233   N/A

I tried using fscanf to read the data from the files, but I don't
understand how to use the template parameter to specify the data format.
I ended up reading line by line with fgetl and then analyzing each line
seperately. This works, but it's slow. I believe that the fscanf
function would be much faster. Can anyone give me an example of how to
efficiently read ASCII files, e.g. the one above?

Matthias
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