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# 1  
Old 11-03-2012
How to sort this?
x:y field
from 0:0 i have 20 points in every direction
so it's -20 to +20 X and -20 to +20 Y
that's 1681 x:y points
now i need to sort them like:
Code:
 0:0 0:1 1:1 1:0 1:-1 0:-1 -1:-1 -1:0 -1:1 0:2 1:2 2:2

etc
every 1 point square from the middle
which algorithm is better?
Last edited by tip78; 11-03-2012 at 03:09 PM..
tip78
# 2  
Old 11-03-2012
Ok, Let's say the positions in front and behind a ":" are a column, do you want col1 sorted in ascending or descending and do you want col2 then sorted in order by ascending or descending?
# 3  
Old 11-03-2012
By calculating polar notation |A|e^iµ then sort them according to 2 rules :
1) those with shortest |A| first
2) for those having same |A|, those having the biggest µ first
(by choosing a suitable interval for µ of course ( ]0,2Pi] ? )
# 4  
Old 11-03-2012
Try using:-
Code:
sort -n +0 -1 input_file

# 5  
Old 11-03-2012
Quote:
Originally Posted by spacebar
Ok, Let's say the positions in front and behind a ":" are a column, do you want col1 sorted in ascending or descending and do you want col2 then sorted in order by ascending or descending?
that's 4 columns then
0 > -20 and 0 > 20 and same for Y
i'm not sure this will work.. i don't need columns
i need exactly as i describe above:
Code:
0:0 0:1 1:1 1:0 1:-1 0:-1 -1:-1 -1:0 -1:1 0:2 1:2 2:2

---------- Post updated at 22:22 ---------- Previous update was at 22:21 ----------

Quote:
Originally Posted by ctsgnb
By calculating polar notation |A|e^iµ then sort them according to 2 rules :
1) those with shortest |A| first
2) for those having same |A|, those having the biggest µ first
(by choosing a suitable interval for µ of course ( ]0,2Pi] ? )
i didn't get it
who is all that symbols??

---------- Post updated at 22:23 ---------- Previous update was at 22:22 ----------

Quote:
Originally Posted by bipinajith
Try using:-
Code:
sort -n +0 -1 input_file

preffer perl
can you just explain algorithm?
tip78
# 6  
Old 11-03-2012
Quote:
preffer perl
can you just explain algorithm?
Did you get the expected results running this command?
# 7  
Old 11-03-2012
Quote:
Originally Posted by bipinajith
Did you get the expected results running this command?
not exactly. got this result:
Code:
-2:0 -1:-2 0:0 0:1 0:2 1:0 1:2

should be:
Code:
-2:0 -1:-2 0:0 0:1 1:0 0:2 1:2

Last edited by tip78; 11-03-2012 at 03:46 PM..
tip78
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