Extract specific data from datalog

Hi, I have a long datalog matrix, and I wanna extract and display only 22nd, 23rd and 24th colum. How do I display only those?

I also wanna make a figure that dipslays the total diffrence over time. The 22nd row is the total number, 23rd is incomming and 24th row is outgoing numbers.

Any idea on how I can solve this?

Answer 1

[Ameer Hamza]

It will be efficient first to read the complete file and then extract these columns.

data = readmatrix('Feb15data.txt');
data = data(:, [22, 23, 24]);