extracting specific part from txt file

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sermet
sermet 2015 年 9 月 3 日
編集済み: Cedric Wannaz 2015 年 9 月 3 日
I need to create column from attached txt file as follows;
a=[87.5;85;82.5;80]; %for each LAT/LON1/LON2/DLON/H
%The txt file's column number is variable.

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Cedric Wannaz
Cedric Wannaz 2015 年 9 月 3 日
編集済み: Cedric Wannaz 2015 年 9 月 3 日
It is difficult to understand what "for each .." means in your question. If you just need to extract the numbers that you specified, the following is one possible approach:
content = fileread( 'trial.txt' ) ;
matches = regexp( content, '[-\d\.]+(?=-\d)', 'match' ) ;
data = str2double( matches ) ;
which outputs
>> data
data =
87.5000 85.0000 82.5000 80.0000
It may not be the most efficient in term of speed, but it is very concise.. could even be a one liner:
data = str2double( regexp( fileread('trial.txt'), '[-\d\.]+(?=-\d)', 'match' )) ;

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