Select specific data text file

Question

Ihiertje 2017-2-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/322825-select-specific-data-text-file

评论： Ihiertje 2017-2-1

Hi,

I have the following data in a text file:

ROI "1":

Xi = 294.00 298.00 319.00 312.00 294.00

Yi = 399.00 423.00 419.00 396.00 399.00

ROI "2":

Xi = 227.00 232.00 243.00 236.00 227.00

Yi = 139.00 157.00 159.00 134.00 139.00

ROI "3":

Xi = 298.00 294.00 310.00 313.00 298.00

Yi = 632.00 654.00 658.00 633.00 632.00

I want get the x and y coordinates for each ROI. How do I get these values from the txt.file. I tried different things with textscan, but nothing works so far.

Thank You.

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Answer 1

KSSV 2017-2-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/322825-select-specific-data-text-file#answer_252888

在 MATLAB Online 中打开

fid = fopen('your text file' );
S = textscan(fid,'%s','delimiter','\n') ;
S = S{1}  ;
fclose(fid) ;
% Get Xi positions 
idxXi = strfind(S, 'Xi');
idxXi = find(not(cellfun('isempty',idxXi)));
% Get Yi positions 
idxYi = strfind(S, 'Yi');
idxYi = find(not(cellfun('isempty',idxYi)));
Xi = zeros(length(idxXi),5) ;
Yi = zeros(length(idxYi),5) ;
for i = 1:length(idxXi)
    Xi(i,:) = str2num(S{idxXi(i)}(5:end)) ;
    Yi(i,:) = str2num(S{idxYi(i)}(5:end)) ;
end