Read spesific rowintervals from .txt file and store them

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Henning Eimstad 2020-3-25

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关闭： MATLAB Answer Bot 2021-8-20

I am trying to read a large .txt doc that continues for maany rows. I have tried to do it manually by the following code:

for i = 12
    C = textscan(fid,'%.6f %.6f',npoints,'delimiter','\n', 'headerlines',i-1);
    p1 = C{1}*1e3;
    y1 = C{2};
    py1 = [p1 y1];
end
for i = 40
    C = textscan(fid,'%.6f %.6f',npoints,'delimiter','\n', 'headerlines',i-1);
    p2 = C{1}*1e3;
    y2 = C{2};
    py2 = [p2 y2];
end
for i = 68
    C = textscan(fid,'%.6f %.6f',npoints,'delimiter','\n', 'headerlines',i-1);
    p3 = C{1}*1e3;
    y3 = C{2};
    py3 = [p3 y3];
end

Is it possible to do this is one loop ? the number of rows are equal for all the "intervals" such that "npoints" is fixed 21. and it is 28 spaces between each interval so I was thinking something like for i = [12:28:1356] where 1356-1376 is the last interval.

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Answer 1

KSSV 2020-3-25

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I = [12 40 68] ; 
iwant = cell(length(I),1) ; 
for i = 1:length(I)
    C = textscan(fid,'%.6f %.6f',npoints,'delimiter','\n', 'headerlines',I(i)-1);
    p1 = C{1}*1e3;
    y1 = C{2};
    py1 = [p1 y1];
    iwant{i} = py1 ; 
end