MATLAB: Reading specific lines from multiple text files

datanumbers

Hi all,

I am only interested in the numerical values of line 10 and line 11 of multiple text files. Right now, i am using below code, but with %s, i get complete string and with %f, i donot get any values. Will really appreciate some helop

clear;

D = 'T:\New\files';
S = dir(fullfile(D, '*.txt'));
N = length(S);
for k = 1:N
  fid = fopen(fullfile(D,S(k).name), 'r');
  linenum = 10;
  h(k)= textscan(fid,'%s',1,'delimiter','\n', 'headerlines',linenum-1);
  fid=fclose(fid);
end

Best Answer

Ya' gotsa' skip the text to get to the floating point value...

...
T=cell2mat(textscan(fid,'%*s%f',1,'HeaderLines',linenum-1));
...

results in

>> T
T =
   180
>>

Related Solutions

MATLAB: Reading numerical data from text fles with string

hello

my suggestion for the second part of your code , assuming you specify the lines to be read :

n_lines = [10 11]; % define lines to read
for k = 1:N
    fid = fopen(fullfile(D,S(k).name), 'r'); % open file
    result = cell(1,numel(n_lines));
    for n = 1:numel(n_lines)
        result(n) = textscan(fid, '%s', 1, 'Headerlines', n_lines(n)-1, 'Delimiter' ,'');
        frewind(fid) % set file position back to the start
    end
    result = [result{:}]; % unbox from cells
    fclose(fid); % close file
end

MATLAB: Concatenate data using fgets

You are closing the file in the loop. close the file after the loop. I assume the below should work.

function read_datapattern(filename)
fid = fopen(filename,'rt');
if fid < 0
  error('error opening file %s\n\n',filename);
end
pattern = fgets(fid);
for n = 1:32767
  nextline = fgets(fid);
  pattern = strcat(pattern, nextline);
fprintf(pattern);
fprintf('\n');
end
fclose(fid);

Best Answer

Related Solutions

MATLAB: Reading numerical data from text fles with string

MATLAB: Concatenate data using fgets

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