Reading numerical data from text fles with string

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fadzhi 2021-2-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/732768-reading-numerical-data-from-text-fles-with-string

评论： Mathieu NOE 2021-2-2

采纳的回答： Mathieu NOE

fdfbec4df1dd4fe8b77aeb96379671e9-tensile_test_data_output.txt

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.....

clear;

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);

fid=fclose(fid);

M = vertcat(A{:});

out = M(:,[9,11]);

data=out;

end

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);

fid=fclose(fid);

end

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Stephen23 2021-2-1

编辑：Stephen23 2021-2-2

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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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采纳的回答

Mathieu NOE 2021-2-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/732768-reading-numerical-data-from-text-fles-with-string#answer_611773

在 MATLAB Online 中打开

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

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Mathieu NOE 2021-2-2

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 2021-2-2

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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