MATLAB: Import .txt file and sorting the data from the title

fscanftextscantxt

.txt looks like this:

R_ASIS_X  1015.56
R_ASIS_Y  218.86
R_ASIS_Z  939.91

I need to import this data from the .txt into matlab variables. I need a way to search for each variable like 'R_ASIS_X' and then when it's found in the .txt I need to save the corresponding data to the right into a variable.

Can somebody help me with this?

Best Answer

Your data file does not have variables named 'position' or 'speed' or 'acceleration'. But you can do, for example,

t = readtable('Marker Coordinate Data.txt', 'ReadVariableName', 0, 'ReadRowNames', 1);
R_ASIS_X = t{'R_ASIS_X', 1};

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MATLAB: Fscanf help ( text file handling )

Hi,

I would use fgetl to read a full line. Than I would check if [ ] exists in that line, e.g. with strfind. If so, remove the [ ] and create a new struct field with this name, e.g. use the eval command.

If the line doesn't include [ ] than you have to assign this variable to the field.

MATLAB: Problem with fscanf command in creating .txt file

    filename1 = ['*new.txt'];%filename

    fid_t=fopen(filename1,'r')

This cannot work: '*new.txt' is not a valid file name, because the * is not allowed.

fid_p = fopen('final.txt','w'); % writing file id
if fid_p < 0, error('Cannot open file for writing.'); end
x = dir ('*new.txt');
for i = 1:length(x)
    filename1 = x(i).name;  %filename
    fid_t = fopen(filename1, 'r');%open it and pass id to fscanf (reading file id)
    if fid_t < 0, error('Cannot open file for reading.'); end
    data = fread(fid_t, inf, '*char');%read data
    fwrite(fid_p, data, 'char');%print data in File_all
    fclose(fid_t);% close reading file id
    fprintf(fid_p,'\n');%add newline
end
fclose(fid_p); %close writing file id

This take the file name from the list of files in x. In addition it uses FREAD and FRWITE, because it is faster to access the files in binary mode.

Never use FOPEN without testing the success.

Working with relative paths is less reliable than absolute path names:

Folder = 'C:\Your\Folder';
FileList  = dir (fullfile(Folder, '*new.txt'));
for iFile = 1:numel(FileList)
    FileName = fullfile(Folder, FileList(iFile).name);
    ...
end

Best Answer

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