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Full Discussion: Sum value from selected lines script (awk,perl)
Top Forums Shell Programming and Scripting Sum value from selected lines script (awk,perl) Post 302360831 by durden_tyler on Saturday 10th of October 2009 04:32:12 PM
Old 10-10-2009
Sorry, but the problem is not clear enough.

Quote:
Originally Posted by paolfili
...
2)Sum the second fields if the difference between first fields is less than 500.
(sliding window)
What's the length of the sliding window ?

- Is it just 2 (1st & 2nd, 2nd & 3rd, 3rd & 4th, ...) ?
- Or is it 3 (1st, 2nd & 3rd; 2nd, 3rd & 4th; ...) ?

Hopefully, it's not a cartesian product, i.e.

1st vs. (2nd, 3rd, 4th, ... , last_row)
2nd vs. (1st, 3rd, 4th, ... , last_row)
3rd vs. (1st, 2nd, 4th, ... , last_row)
...
last_row vs. (1st, 2nd, 3rd, ..., last-1_row)

Quote:
...
1) Becouse 12345678/500 and 12345989/500 both result 24691 sum=4+13
We cannot group the 3rd line so sum=205
And we group the 4th and 5th line so sum=74+22
- Ok, and what do you want to do with the sum ?
- Do you want to display it ? Or do nothing with it (highly unlikely) ?
- If you want to display it, then how ? The total against each row ? Or the total against the first row only ? Or against the second row only ?

Quote:
...
and the 3rd,4th and 5th becouse 12346819 (of the 5th line) - 12346356 (of the 3th line) < 500
This begs the first counter-question. Why compare the 3rd, 4th and 5th (considering that you have been comparing two-at-a-time all this while) ?
So again, what's the length of the sliding window ?

I guess a very simple example of your input file should help here. So, let's say your input file is as follows:

Code:
$
$ cat f1
100 1
200 2
300 3
400 4
500 5
600 6
700 7
$

What do you want your output to look like ?

tyler_durden
 

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ln

LN(1)								   User Commands							     LN(1)

NAME

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SYNOPSIS

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DESCRIPTION

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AUTHOR

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