Reading data after Importing text files into variables with the same name

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amberly hadden 2015-8-20

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评论： amberly hadden 2015-8-21

I have this code from a on line source

files  = dir( '*.txt' ) ;
nFiles = length( files ) ;
names  = cell( nFiles, 1 ) ;
data   = cell( nFiles, 1 ) ;
for dId = 1 : nFiles
  names{dId} = files(dId).name ;
  fId  = fopen( files(dId).name, 'r' ) ;
  cols = textscan( fId, '%f %f', 'headerlines', 1 ) ;
  data{dId} = [cols{:}] ;
  fclose( fId ) ;    
end

can anybody help me how can I then read my files to reach the data set in each individual file ? Thanks

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Answer 1

dpb 2015-8-20

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You've read the files already, you've got nFiles cells of a 2D array that's Nx2 for each file where N may be a different length.

To address the data of a given file, "use the curlies, Luke!" --

xy=data{idx};

will return the full array for the idx th entry, idx=1:nFiles

To refer to a subset within the array, follow with a set of indices in "normal" parentheses--

x=data{idx}(:,1);

would be the first column of the above array.

See

doc cell % and links to "addressing cell contents" for the details

and look at the "Getting Started" section on data types for cell arrays and tutorial information.

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dpb 2015-8-21

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data{1}(:,1) will return all rows of the first column of the first cell in the array data. That would be a single value iff size(,1) of that cell array is unity.

Not being able to see your terminal from here [ :) ] it's a little hard to know what, precisely, is happening, but let's start with