MATLAB Central Newsreader - how to read a file skipping all the text lines

how to read a file skipping all the text lines

Kushagra Mittal — Wed, 30 Jul 2008 23:58:01 -0400

Hi
I want to read a ASCII file (given below). I only want to
read the numerical data in the form of a matrix and skip all
other text lines and the last character in the file which is ')'

Please suggest me how to do it?

Thanks very much,
Kushagra

----------------------------
File :
----------------------------

(title "Mean Volume fraction (air) ")
(labels "Position" "Mean Volume fraction (air) ")

((xy/key/label "line-14")
-0.0374802 0
-0.0349168 0
-0.032392 0
-0.0297849 0
-0.02719 0
-0.0245914 0
-0.0220529 0
-0.0195992 0
-0.0171695 0
)

Re: how to read a file skipping all the text lines

roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) — Thu, 31 Jul 2008 06:07:15 -0400

In article <g6qv69$4cu$1@fred.mathworks.com>,
Kushagra Mittal <kmittal@ymail.com> wrote:
>I want to read a ASCII file (given below). I only want to
>read the numerical data in the form of a matrix and skip all
>other text lines and the last character in the file which is ')'

>Please suggest me how to do it?

Use textscan(), telling it that ( and ) are comment characters.
--
"You may comand nature to the extent only in which you are willing to
obey her." -- Walter Russell

Re: how to read a file skipping all the text lines

Andres — Tue, 19 Aug 2008 07:09:02 -0400

"Miroslav Balda" <balda.nospam@cdm.it.cas.cz> wrote in
message <g8dile$doh$1@fred.mathworks.com>...
> "Kushagra Mittal" <kmittal@ymail.com> wrote in message
> <g6qv69$4cu$1@fred.mathworks.com>...
> > Hi
> > I want to read a ASCII file (given below). I only want
to
> > read the numerical data in the form of a matrix and
skip all
> > other text lines and the last character in the file
which
> is ')'
> >
> > Please suggest me how to do it?
> >
> > Thanks very much,
> > Kushagra
> >
> > ----------------------------
> > File :
> > ----------------------------
> >
> > (title "Mean Volume fraction (air) ")
> > (labels "Position" "Mean Volume fraction (air) ")
> >
> > ((xy/key/label "line-14")
> > -0.0374802 0
> > -0.0349168 0
> > -0.032392 0
> > -0.0297849 0
> > -0.02719 0
> > -0.0245914 0
> > -0.0220529 0
> > -0.0195992 0
> > -0.0171695 0
> > )
> >
>
> Hi,
>
> I think that your file is good to be read by the function
> txt2mat from File Exchange, Id 18430.
>
> Mira

I agree. One of the txt2mat-solutions would be to use
the 'BadLineString' argument to ignore all lines containing
a ')' :

filename = 'C:\myfile.txt';
data = txt2mat(filename,'BadLineString',{')'});

Best regards
Andres

Re: how to read a file skipping all the text lines

beginner1.mat@hotmail.com — Mon, 18 Aug 2008 23:51:56 -0400

On Jul 30, 11:07=A0pm, rober...@ibd.nrc-cnrc.gc.ca (Walter Roberson)
wrote:
> In article <g6qv69$4c...@fred.mathworks.com>,
>
> Kushagra Mittal <kmit...@ymail.com> wrote:
> >I want to read a ASCII file (given below). I only want to
> >read the numerical data in the form of a matrix andskipall
> >other textlinesand the last character in the file which is ')'
> >Please suggest me how to do it?
>
> Usetextscan(), telling it that ( and ) are comment characters.

Is there a way to have more than one comment character? Say, one of
the lines starts with "Titles" and the other with "Lables". Can you
set commentStyle to skip both of those lines?
fid =3D fopen('data.txt');
Data =3D textscan(fid, '%f%f', 'commentStyle', ['Titles', 'Lables']);%
This doesn't work, but wondering what would???
fclose(fid);
Thanks

Re: how to read a file skipping all the text lines

Paul — Tue, 19 Aug 2008 00:17:03 -0400

beginner1.mat@hotmail.com wrote in message
<94268f3f-48b4-45af-b762-be0eda8c3364@x16g2000prn.googlegroups.com>...
> On Jul 30, 11:07=A0pm, rober...@ibd.nrc-cnrc.gc.ca (Walter
Roberson)
> wrote:
> > In article <g6qv69$4c...@fred.mathworks.com>,
> >
> > Kushagra Mittal <kmit...@ymail.com> wrote:
> > >I want to read a ASCII file (given below). I only want to
> > >read the numerical data in the form of a matrix andskipall
> > >other textlinesand the last character in the file which
is ')'
> > >Please suggest me how to do it?
> >
> > Usetextscan(), telling it that ( and ) are comment
characters.
>
> Is there a way to have more than one comment character?
Say, one of
> the lines starts with "Titles" and the other with
"Lables". Can you
> set commentStyle to skip both of those lines?
> fid =3D fopen('data.txt');
> Data =3D textscan(fid, '%f%f', 'commentStyle', ['Titles',
'Lables']);%
> This doesn't work, but wondering what would???
> fclose(fid);
> Thanks

Try putting Titles and Lables in a cell array and see if
that works.

Re: how to read a file skipping all the text lines

beginner1.mat@hotmail.com — Tue, 19 Aug 2008 02:03:29 -0400

On Aug 18, 5:17=A0pm, "Paul " <p...@ceri.memphis.edu> wrote:
> beginner1....@hotmail.com wrote in message
>
> <94268f3f-48b4-45af-b762-be0eda8c3...@x16g2000prn.googlegroups.com>...
>
>
>
> > On Jul 30, 11:07=3DA0pm, rober...@ibd.nrc-cnrc.gc.ca (Walter
> Roberson)
> > wrote:
> > > In article <g6qv69$4c...@fred.mathworks.com>,
>
> > > Kushagra Mittal <kmit...@ymail.com> wrote:
> > > >I want to read a ASCII file (given below). I only want to
> > > >read the numerical data in the form of a matrix andskipall
> > > >other textlinesand the last character in the file which
> is ')'
> > > >Please suggest me how to do it?
>
> > > Usetextscan(), telling it that ( and ) are comment
> characters.
>
> > Is there a way to have more than one comment character?
> Say, one of
> > the lines starts with "Titles" and the other with
> "Lables". =A0Can you
> > set commentStyle to skip both of those lines?
> > fid =3D3D fopen('data.txt');
> > Data =3D3D textscan(fid, '%f%f', 'commentStyle', ['Titles',
> 'Lables']);%
> > This doesn't work, but wondering what would???
> > fclose(fid);
> > Thanks
>
> Try putting Titles and Lables in a cell array and see if
> that works.

It didn't...seems like that is used for start and stop when put into a
cell array.

Re: how to read a file skipping all the text lines

Miroslav Balda — Tue, 19 Aug 2008 04:37:02 -0400

"Kushagra Mittal" <kmittal@ymail.com> wrote in message
<g6qv69$4cu$1@fred.mathworks.com>...
> Hi
> I want to read a ASCII file (given below). I only want to
> read the numerical data in the form of a matrix and skip all
> other text lines and the last character in the file which
is ')'
>
> Please suggest me how to do it?
>
> Thanks very much,
> Kushagra
>
> ----------------------------
> File :
> ----------------------------
>
> (title "Mean Volume fraction (air) ")
> (labels "Position" "Mean Volume fraction (air) ")
>
> ((xy/key/label "line-14")
> -0.0374802 0
> -0.0349168 0
> -0.032392 0
> -0.0297849 0
> -0.02719 0
> -0.0245914 0
> -0.0220529 0
> -0.0195992 0
> -0.0171695 0
> )
>

Hi,

I think that your file is good to be read by the function
txt2mat from File Exchange, Id 18430.

Mira

Re: how to read a file skipping all the text lines

Paul — Tue, 19 Aug 2008 04:37:02 -0400

beginner1.mat@hotmail.com wrote in message
<7f58cd55-3107-4b4e-8b5b-bee2840f17d5@r15g2000prh.googlegroups.com>...
> On Aug 18, 5:17=A0pm, "Paul " <p...@ceri.memphis.edu> wrote:
> > beginner1....@hotmail.com wrote in message
> >
> >
<94268f3f-48b4-45af-b762-be0eda8c3...@x16g2000prn.googlegroups.com>...
> >
> >
> >
> > > On Jul 30, 11:07=3DA0pm, rober...@ibd.nrc-cnrc.gc.ca
(Walter
> > Roberson)
> > > wrote:
> > > > In article <g6qv69$4c...@fred.mathworks.com>,
> >
> > > > Kushagra Mittal <kmit...@ymail.com> wrote:
> > > > >I want to read a ASCII file (given below). I only
want to
> > > > >read the numerical data in the form of a matrix
andskipall
> > > > >other textlinesand the last character in the file which
> > is ')'
> > > > >Please suggest me how to do it?
> >
> > > > Usetextscan(), telling it that ( and ) are comment
> > characters.
> >
> > > Is there a way to have more than one comment character?
> > Say, one of
> > > the lines starts with "Titles" and the other with
> > "Lables". =A0Can you
> > > set commentStyle to skip both of those lines?
> > > fid =3D3D fopen('data.txt');
> > > Data =3D3D textscan(fid, '%f%f', 'commentStyle',
['Titles',
> > 'Lables']);%
> > > This doesn't work, but wondering what would???
> > > fclose(fid);
> > > Thanks
> >
> > Try putting Titles and Lables in a cell array and see if
> > that works.
>
> It didn't...seems like that is used for start and stop
when put into a
> cell array.

Sorry about that.

What about declaring the '(' as a commentStyle and the ')'
as an endOfLine character?