Hello,
I have this matrix [20*4 - but it could be n*4 , with n~100,000] in
file "EL_list" like this:
1, 1, 2, 3
2, 4, 1, 5
3, 5, 1, 6
4, 7, 5, 6
5, 8, 7, 9
6, 8, 5, 7
7, 10, 9, 7
8, 10, 11, 12
9, 7, 13, 10
10, 14, 15, 16
11, 14, 17, 15
12, 17, 14, 18
13, 13, 16, 10
14, 16, 15, 11
15, 16, 11, 10
16, 19, 20, 21
17, 22, 15, 20
18, 17, 20, 15
19, 23, 20, 24
20, 25, 24, 20
I would like to replace some numbers in "EL_list" but only in columns
2,3,4 using the criterium by line in file "criterium" (column 1 are
the new numbers, column 2 the old ones).
1 1
2 3
3 5
4 12
5 13
6 14
7 15
8 16
9 17
10 18
11 19
12 10
13 21
14 22
15 23
16 24
17 25
For example all the 7 have to replaced by 15 and so on..
-- How to implement it in a fast end efficient code?
many thanks, Alex
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