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Top Forums Shell Programming and Scripting awk , conditional involving line and column Post 302602074 by agama on Saturday 25th of February 2012 10:36:41 PM
Old 02-25-2012
Quote:
Originally Posted by codemaniac
A shorter version

Code:
 
awk '$1 ~/Si/{if(max < $2){max = $2}} $1 ~ /O/ || $1 ~ /H/{if ($2 > max){print $0}}'

@codemaniac: your shorter version doesn't work for the case below:

Code:
type of atoms z vz
Si 34 54
O 35 56
H 14 13
Si 40 17
O 65 18
H 70 19
Si 24 20
H 85 21
O 90 12
Si 12 34

The first O value is larger than the previous Si, but not larger than the maximum Si value in the file; your script will print it because it's larger than the previously observed Si value.
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RAND(3) 								 1								   RAND(3)

rand - Generate a random integer

SYNOPSIS
int rand (void ) DESCRIPTION
int rand (int $min, int $max) If called without the optional $min, $max arguments rand(3) returns a pseudo-random integer between 0 and getrandmax(3). If you want a random number between 5 and 15 (inclusive), for example, use rand(5, 15). Caution This function does not generate cryptographically secure values, and should not be used for cryptographic purposes. If you need a cryptographically secure value, consider using random_int(3), random_bytes(3), or openssl_random_pseudo_bytes(3) instead. Note On some platforms (such as Windows), getrandmax(3) is only 32767. If you require a range larger than 32767, specifying $min and $max will allow you to create a range larger than this, or consider using mt_rand(3) instead. PARAMETERS
o $min - The lowest value to return (default: 0) o $max - The highest value to return (default: getrandmax(3)) RETURN VALUES
A pseudo random value between $min (or 0) and $max (or getrandmax(3), inclusive). EXAMPLES
Example #1 rand(3) example <?php echo rand() . " "; echo rand() . " "; echo rand(5, 15); ?> The above example will output something similar to: 7771 22264 11 SEE ALSO
srand(3), getrandmax(3), mt_rand(3), random_int(3), random_bytes(3), openssl_random_pseudo_bytes(3). PHP Documentation Group RAND(3)
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