Effective way to extract rows (range) from a text file
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I made a small loop to extract rows [range 183:262326] to make a column of 262144x1 column vector. The loop is very inefficient and takes a lot of time to execute. The code is below. Is there any more efficient way ? I dont want to use "Import Data" feature in MATLAB, I want to use code only.
fid=fopen('ABC.txt');
j=1;
for i=183:262326
linenum = i;
C(j,1) = textscan(fid,'%f',1,'delimiter','\n', 'headerlines',i-1);
j = j+1;
end
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Image Analyst
2019년 5월 12일
Maybe, but you forgot to attach abc.txt so we can't really help very effectively until you do. Maybe dlmread() or importdata() would do the trick, but we don't know until you attach the text file.
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Jeremy Hughes
2019년 5월 12일
Readling line by line is quite ineffecient.
Try this:
C = textscan(fid,'%f','delimiter','\n', 'headerlines',182);
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Jeremy Hughes
2019년 5월 15일
There must be something else in the file other than numbers that causes textscan to stop after the first number.
Glad you found a solution.
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