Read row x to row y in a textfile

1 visualizzazione (ultimi 30 giorni)
Marthe Fenne Vestly
Marthe Fenne Vestly il 27 Ott 2017
Commentato: Cedric il 2 Nov 2017
Hi,
I have a very long textfile that I want to read the lines from 32781 to 32894, excluding the lines above and below, and store the lines in a new text files. I have made this code, but it does not work.
The txt-file have some lines with two columns and other with three and four. The lines I am interested in only have two columns.
[T1,PSA1]=textread('FFC_M7_1.txt', '%f %f','headerlines',32781);
[T,PSA] = [T1(32782:32894), PSA1(32782:32894)]
f1=fopen('FFC_M7_1_test.txt','w');
for i= 1:length(T)
fprintf(f1,'%11.4f %11.4f\n',[T(i) PSA(i)]);
end
fclose(f1);
This message appear when I try to run the code:
Error using dataread
Trouble reading floating point number from file (row 114, field 1) ==> Frequency (Hz) A
Error in textread (line 174)
[varargout{1:nlhs}]=dataread('file',varargin{:}); %#ok<REMFF1>
Error in WritePSA (line 1)
[T1,PSA1]=textread('FFC_M7_1.txt', '%f %f','headerlines',32781);
Does anyone know how to do this?
Thanks, Marthe

Risposta accettata

Cedric
Cedric il 27 Ott 2017
Modificato: Cedric il 27 Ott 2017
Is the following working?
[T1,PSA1]=textread('FFC_M7_1.txt', '%f %f %*s %*s','headerlines',32781);
or
content = fileread( 'FFC_M7_1_test.txt' ) ;
lineStarts = [0, strfind( content, sprintf('\n') )] + 1 ;
block = content(lineStarts(32782) : (lineStarts(32895)-1)) ;
data = reshape( str2double( regexp( block, '[\d\.\-]+', 'match' )), 2, [] ).' ;
I cannot test right now though.
  14 Commenti
Marthe Fenne Vestly
Marthe Fenne Vestly il 2 Nov 2017
You are right, I was comparing two different files. Sorry about that, and thanks a lot.
Cedric
Cedric il 2 Nov 2017
My pleasure!

Accedi per commentare.

Più risposte (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by