replacing numbers in LARGE MATRIX with criterium in 2 columns (a--> b)

[Aahz]

In article <68d22002-fc0a-4590-9395-c78b6ee412b2 at r34g2000vba.googlegroups.com>,
Alexzive  <zasaconsulting at gmail.com> wrote:
>
>I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
>file "EL_list" like this:

Take a look at NumPy
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan