splitting CSV file by columns

Question

I have a really huge CSV files. There are about 1700 columns and 40000 rows like below:

x,y,z,x1,x2,x3,x4,x5,x6,x7,x8,x9,...(about 1700 more)...,x1700
0,0,0,         


        

Answer 1

You can open the file in Microsoft Excel, delete the extra columns, save as csv for file #1. Repeat the same procedure for the other 2 tables.