Loop for reading and extracting data from a single line of multiple text files.

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James 2024-9-16

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评论： Star Strider 2024-9-17

I have the following code that I would like to put into a loop to read multiple text files.

txt = fileread('Test01.txt');
  temppos = strfind(txt,'Ground Temperature:');
  endpos = strfind(txt, '°C');

    for k = 1:numel(temppos)
        section{k,:} = txt(temppos(k):endpos(k));
    end

    for k = 1:numel(section)
        temp(k,:) = sscanf(section{k}, 'Ground Temperature: %f');
    end

    Results = table(temp, 'VariableNames',{'Temp'});

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James 2024-9-16

移动：Voss 2024-9-16

Please see the files attached.

James 2024-9-16

移动：Voss 2024-9-16

Having issues saving multiple files. Could only save one. But the only thing changing in the data is the file name and the temp.

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Star Strider 2024-9-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2153195-loop-for-reading-and-extracting-data-from-a-single-line-of-multiple-text-files#answer_1517515

编辑：Star Strider 2024-9-16

在 MATLAB Online 中打开

Test01.txt

I generally do something like this —

files = dir('*.txt');
for k = 1:numel(files)
    txt = fileread(files(k).name);
    temppos = strfind(txt,'Ground Temperature:');
    endpos = strfind(txt, '°C');
    for k = 1:numel(temppos)
        section{k,:} = txt(temppos(k):endpos(k));
    end
    for k = 1:numel(section)
        temp(k,:) = sscanf(section{k}, 'Ground Temperature: %f');
    end
    Results{k} = table(temp, 'VariableNames',{'Temp'});
end
Results{:}
ans = table
    Temp
    ____

    29.3

This assumes the files are already in your working directory and on your MATLAB search path.

If that is not the situation in your application, you will need something like this:

files = dir('C:\PathName\*.txt')

and then:

filename{k} = fullfile('C:\PathName\',files(k).name)

text = fileread(filename{k});

or something similar. It may be neecessary for you to experiment a bit, depending on your situation.

EDIT — Corrected typographical errors.

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Star Strider 2024-9-16

在 MATLAB Online 中打开

My pleasure!

I created ‘Results’ here as a cell array. It should save all of them, and:

Results{:}

should be a cell array of the table arrays your code creates.

You can examine each one individually as:

Results{1}

Results{2}

...

Results{n}

and so forth, for as many as you have created.

If you want to concatenate them instead, the variable names in each havee to be different, so tthis lilne:

Results{k} = table(temp, 'VariableNames',{'Temp'});

becomes:

Results{k} = table(temp, 'VariableNames',{sprintf('Temp_%d',k)});

and then you can conatenate tthem after the loop with:

AllResults = horzcat(Results{:})

To illustrate:

for k = 1:5
    temp = round(rand*10,1);
    Results{k} = table(temp, 'VariableNames',{sprintf('Temp_%d',k)});
end
Results{:}
ans = table
    Temp_1
    ______

     4.2  
ans = table
    Temp_2
    ______

     2.7  
ans = table
    Temp_3
    ______

     6.5  
ans = table
    Temp_4
    ______

     9.1  
ans = table
    Temp_5
    ______

     5.9  
AllResults =  horzcat(Results{:})
AllResults = 1x5 table
    Temp_1    Temp_2    Temp_3    Temp_4    Temp_5
    ______    ______    ______    ______    ______

     4.2       2.7       6.5       9.1       5.9  

Try that. I’ll keep working with you until we get the result you want.

James 2024-9-17

Thank you!

Star Strider 2024-9-17

As always, my pleasure!

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Loop for reading and extracting data from a single line of multiple text files.

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Loop for reading and extracting data from a single line of multiple text files.

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