How to read a large CSV in chunks;

I have the following code which filters a very large CSV.

opts = detectImportOptions('Z_EnergySequence.dat');
data = readtable('Z_EnergySequence.dat',opts);
tol = 1e-6;
filter = 4.125;
filterreddata = data(abs(data.X - filter) < tol, :);
filteredions = data(ismember(data.IonN, filterreddata.IonN),:);
filteredions(1:2:end,:)= [];
writetable(filteredions, 'Published/Z_EnergySequence1.csv');

I think I may be getting errors in the data processing. Is there a way in which I can read the whole CSV in chunks and output to the same file?

[Jan]

 I think I may be getting errors in the data processing

This seems to be a pure speculation. Do not try to fix not existing problems.

Answer 1

[Rishi Binda]

If you want to read specific range of the generated csv file you can use one of the following :

• csvread
• dlmread
• xlsread