Ignore text in a txt file

Asked by Thar on 18 Feb 2019

Latest activity Commented on by Star Strider on 18 Feb 2019

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Hi all!

I have 50 txt files name 001.txt until 050.txt and look like:

time [ms]: 100,00

Nr. [scans]: 1

Nr. [pixels]: 0

Data [m]

[first] [second] [third] [fourth]

296,95; 511,000; 11,000; 0,000

297,04; 503,000; 15,333; 0,000

297,13; 505,000; 15,000; 0,000

297,22; 553,000; 16,667; 0,000

297,31; 515,000; 2,333; 0,000

297,40; 541,000; -3,333; 0,000

297,49; 505,000; -1,333; 0,000

297,58; 530,000; 7,333; 0,000

297,67; 506,000; 9,000; 0,000

I want to ignore the line with text and keep only the numeric columns of all 50 files.

Any ideas??

Thank you!

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1 Answer

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Answer by Star Strider on 18 Feb 2019

It depends on the function you are using to read them. In the textscan (link) and other functions that use textscan, they are called header lines. You can skip over them by using the 'HeaderLines' (link) name-value pair. Other functions handle them differently, so for example in dlmread (link) you would specify the number of rows to skip using the Starting Row Offset (link) number.

Choose a function and read the documentation for it!

3 Comments

Thar on 18 Feb 2019

I used this:

folder = 'F:\fi\di';
 Allfiles = dir(fullfile(folder, '*.txt'));
    for k = 1:length(Allfiles)
      initialFileName = Allfiles(k).name;
      fullFileName = fullfile(folder, initialFileName);
      c(k)=textscan( fullFileName, '%f%f%f%f','headerlines','5' );
    end

but something is wrong. The message is:

Error using textscan

HeaderLines must be integer-valued.

Walter Roberson on 18 Feb 2019

'HeaderLines', 5

Star Strider on 18 Feb 2019

@Walter — Thank you yet again!

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Ignore text in a txt file

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