MATLAB: How do import data

importing data

For this part I have to get data from the first row. Which I know you use fgetl. But what if my data has 4 columns and 5 rows. And I want to get data from the first column. How do I do that?

if true

 % filename='lab4_data.txt';
fid=fopen(filename,'r'); %opening read only
temperature=fgetl(fid);
temperature=str2num(temperature);
fclose(fid);code
  end

Best Answer

   [a,~,~,~]=textread('file.txt')

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MATLAB: How to print blank rows on top of CSV file

Yes. It should give you a blank row. Print a whitespace should also do it.

fid=fopen('test.csv','w+t');
fprintf(fid,'\n');
fprintf(fid,'%s\n','line');
a={' ',' ','text'};
fprintf(fid,'%s\n',a{:});
fclose(fid);

MATLAB: Importing text file data

What part are you not able to make more versatile?

If you know a priori the number of columns, you can make the following changes

 function data = Load_Data( filename, strain_command_data, nCol )
    if nargin < 3
       nCol = 5 ;           % Default.
    end
    formatSpec = repmat( '%f', 1, nCol ) ;
    FID = fopen( filename ) ;
    data = textscan( FID, formatSpec, 'HeaderLines', 5, 'CollectOutput', 1 ) ;
    .. etc.
 end

If you don't know a priori the number of lines, you could determine it based on one line of the header. If the file had the following content

 Header line 1..
 Header line 2..
 dataID   time   x    y
 1        120    8.7  9.1

you could determine that there are 4 columns based on the 3rd line of the header which contains column labels..

 function data = Load_Data( filename, strain_command_data )
    fid = fopen( filename, 'r' ) ;
    fgetl( fid ) ;                              % Skip line 1.
    fgetl( fid ) ;                              % Skip line 2.
    colLabels = fgetl( fid ) ;
    nCol = numel( regexp( colLabels, '\s+' )) + 1 ;
    formatSpec = repmat( '%f', 1, nCol ) ;
    data = textscan( fid, formatSpec, 'CollectOutput', 1 ) ;
    .. etc.
 end

Best Answer

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