Difference between revisions of "Ns rand"
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% ns_rand 10 | % ns_rand 10 | ||
7 | 7 | ||
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| + | '''CAVEAT''' | ||
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| + | : [ns_rand 1] will always produce the result 0. [ns_rand 2] will produce the desired "coin flip" outcome of 0 or 1. This is standard with [http://java.sun.com/j2se/1.4.2/docs/api/java/util/Random.html#nextInt(int) Java's java.util.Random implementation of nextInt] and most other random number libraries. | ||
'''SEE ALSO''' | '''SEE ALSO''' | ||
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| − | [[Category Documentation]] | + | [[Category:Documentation]] [[Category:Core Tcl API]] |
Latest revision as of 19:56, 7 February 2009
Man page: http://aolserver.com/docs/tcl/ns_rand.html
NAME
- ns_rand - Generate a random number
SYNOPSIS
- ns_rand ?maximum?
DESCRIPTION
- This command generates a cryptographically secure random number. If maximum is not specified, the random number returned is a floating-point value n such that 0.0 <= n < 1.0. If maximum is specified, it must be a positive integer between 1 and 2147483647, in which case ns_rand will return an integer value n such that 0 <= n <= max - 1.
- Internally ns_rand is implemented with the drand48() and lrand48() standard library functions. An internal random seed is generated the first time ns_rand is called after the server starts.
EXAMPLES
% ns_rand 0.39938485692
% ns_rand 10 7
CAVEAT
- [ns_rand 1] will always produce the result 0. [ns_rand 2] will produce the desired "coin flip" outcome of 0 or 1. This is standard with Java's java.util.Random implementation of nextInt and most other random number libraries.
SEE ALSO
