Reading numerical data from text fles with string

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Dear all,
I will really appreciate f you help me out in this regards. I am using follwing code to read multiple text files and genrating a data based on specific columns. I now wanted to read the numeric values from line 10 and 11 and place them in first and column of data and repeat them for all the values of a specific cell array. Based on new cell array, the values should change till the end of that array and so on.....
D = 'T:\Intelli_test\New\files';
S = dir(fullfile(D, '*.txt'));
N = length(S);
% A = cell(N,1);
fmt = '%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f%f';
for k = 1:N
fid = fopen(fullfile(D,S(k).name), 'r');
A(k)= textscan(fid, fmt, 'Delimiter', '\t', ...
'headerlines', 33, ...
'CollectOutput', 1);
M = vertcat(A{:});
out = M(:,[9,11]);
i am now trying to add a loop like this to get the values but i am getting nothing
for k = 1:N
fid = fopen(fullfile(D,S(k).name), 'r');
linenum = 10;
h(k)= textscan(fid,'%f',1,'delimiter','\n', 'headerlines',linenum-1);
  1 Comment
Stephen23 on 1 Feb 2021
Edited: Stephen23 on 2 Feb 2021
Note that this line
M = vertcat(A{:});
and the ones that follow it until the end of the loop should go after the loop.
There is no point in calling them inside the loop like that.

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Accepted Answer

Mathieu NOE
Mathieu NOE on 1 Feb 2021
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
result = [result{:}]; % unbox from cells
fclose(fid); % close file
Mathieu NOE
Mathieu NOE on 2 Feb 2021
can you share th txt file that generates this error ?
can you copy the output of whos from your workspace ? I'm interested to see what is in vraibales str and tmp ...
fadzhi on 2 Feb 2021
i have attached the files and whos
Name Size Bytes Class Attributes
A 9x1 970344 cell
D 1x25 50 char
M 6732x18 969408 double
N 1x1 8 double
S 9x1 8061 struct
data 4386x2 70176 double
fid 1x1 8 double
fmt 1x36 72 char
k 1x1 8 double
n 1x1 8 double
n_lines 1x2 16 double
out 6732x2 107712 double
result 9x2 144 double
str 1x1 258 cell
tmp 0x0 0 cell

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More Answers (1)

fadzhi on 2 Feb 2021
I found out that the units are problematic....I want to extract Dehnrate which also has a unit 1/s, 'Dehnrate: 10.0 [1/s] ', so i think somehow this 1 is problematic because it works for other quantities

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