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
2 commentaires
Image Analyst
le 12 Mai 2019
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
le 12 Mai 2019
Readling line by line is quite ineffecient.
Try this:
C = textscan(fid,'%f','delimiter','\n', 'headerlines',182);
2 commentaires
Jeremy Hughes
le 15 Mai 2019
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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