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thanks, reading binary file is much faster!

1 minute is not too bad, and I am not going to spend hours to squeeze a few seconds out of it. The problem is that I need to call the function many times (>=40?) during the day. And it is not fun to...

You are right. I used to test it on small set in the last a few weeks. At this time point, I need to test it over large set more often. And it becomes a pain on neck.

it is a very simple csv file with three fields:
time, double, double

but I have 11,737,015 lines. "wc" it on my machine takes more than 1 minutes. The reader uses getline() and the following...

hey, there,

At beginning of my code , I first read a large data file and then do analysis of the dataset. I never change the dataset. The datafile is large, >=300M. I frequently change the...