RANDOM(3F)RANDOM(3F)NAME
random, drandm, irandm - better random number generator
SYNOPSIS
function irandm (iflag)
function random (iflag)
double precision function drandm (iflag)
DESCRIPTION
These functions use random(3) to generate sequences of random numbers, and should be used rather than the older functions described in man
3f rand. If iflag is non-zero, it is used as a new seed for the random number generator, and the first new random value is returned.
Irandm returns positive integers in the range 0 through 2147483647 ( 2**31-1). Random and drandm return values in the range 0. through 1.0
by dividing the integer random number from random(3) by 2147483647 .
FILES
/usr/lib/libF77.a
SEE ALSO random(3)4.3 Berkeley Distribution May 15, 1985 RANDOM(3F)
Check Out this Related Man Page
RANDOM(3) Linux Programmer's Manual RANDOM(3)NAME
random, srandom, initstate, setstate - random number generator.
SYNOPSIS
#include <stdlib.h>
long int random(void);
void srandom(unsigned int seed);
char *initstate(unsigned int seed, char *state, size_t n);
char *setstate(char *state);
DESCRIPTION
The random() function uses a non-linear additive feedback random number generator employing a default table of size 31 long integers to
return successive pseudo-random numbers in the range from 0 to RAND_MAX. The period of this random number generator is very large, approx-
imately 16*((2**31)-1).
The srandom() function sets its argument as the seed for a new sequence of pseudo-random integers to be returned by random(). These
sequences are repeatable by calling srandom() with the same seed value. If no seed value is provided, the random() function is automati-
cally seeded with a value of 1.
The initstate() function allows a state array state to be initialized for use by random(). The size of the state array n is used by init-
state() to decide how sophisticated a random number generator it should use -- the larger the state array, the better the random numbers
will be. seed is the seed for the initialization, which specifies a starting point for the random number sequence, and provides for
restarting at the same point.
The setstate() function changes the state array used by the random() function. The state array state is used for random number generation
until the next call to initstate() or setstate(). state must first have been initialized using initstate() or be the result of a previous
call of setstate().
RETURN VALUE
The random() function returns a value between 0 and RAND_MAX. The srandom() function returns no value. The initstate() and setstate()
functions return a pointer to the previous state array, or NULL on error.
ERRORS
EINVAL A state array of less than 8 bytes was specified to initstate().
NOTES
Current "optimal" values for the size of the state array n are 8, 32, 64, 128, and 256 bytes; other amounts will be rounded down to the
nearest known amount. Using less than 8 bytes will cause an error.
CONFORMING TO
BSD 4.3
SEE ALSO rand(3), srand(3)GNU 2000-08-20 RANDOM(3)
Hi, how do I use /dev/urandom to generate a single number between 1-100? I can od /dev/urandom but it gives me an endless list of random numbers, I just want 1 between 1-100. How can I get that? Thanks. (12 Replies)
Hi one and all,
I'm working on a Bash script that is designed to calculate how much IP traffic has passed through a port to determine traffic volume over a given amount of time.
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Hi folks
I'm coding on Ubuntu 9.04 standard shell.
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When I do
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Thanks in advance :) (15 Replies)
Hi,
I have 200 pictures in a folder and I would like move 10 random pictures every week to given folder automatically.
I have this server on 1and1.com.
So I tried the following using Bash script for manual copy and paste for testing
#!/bin/bash
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Hi,
Is there a tool somewhat parallel to rev, but which randomizes instead of reverses?
I've tried rl, but I can only get it to randomize words.
I was hoping for something like this
echo "hello" | ran
leolh
less simpler solutions are also welcome.
Sorry if the question is... (21 Replies)
Hello,
This is my code:
nb_lignes=`wc -l $1 | cut -d " " -f1`
for i in $(seq $nb_lignes)
do
m=`head $1 -n $i | tail -1`
//command
done
Please how can i change it to get Get 20% of lines in File randomly to apply "command" on each line ? 20% or 40% or 60 % (it's a parameter)
Thank you. (15 Replies)
i want to generate a random number through a script, and even if anyone reads the script, they wont be able to figure out what the random number is. only the person who setup the script would know it.
something like this could work: random
the full thread is here:
... (13 Replies)
I have two files containing hundreds of different sequences with the same Identifiers (ID-001, ID-002, etc.,), something like this:
Infile1:
ID-001 ATGGGAGCGGGGGCGTCTGCCTTGAGGGGAGAGAAGCTAGATACA
ID-002 ATGGGAGCGGGGGCGTCTGTTTTGAGGGGAGAGAAGCTAGATACA
ID-003... (18 Replies)
Hi,
I've been attempting to create a script that downloads web pages at random intervals to mimic typical user usage. However I'm struggling to link $url to the URL list and thus wget complains of a missing URL. Any ideas?
Thanks
#!/bin/sh
#URL List
url1="http://www.bbc.co.uk"... (14 Replies)
Hello,
I have a column which have 7200 numbers and I am deciding to pick up 1440 numbers randomly without any reputation? Could any one let me know which script in unix will be work for my case?
Regards
Sajjad (17 Replies)
Hi,
I am in a terrible emergency. I have multiple cdr files with line count >6000.
I need to append |0| | | | | | | |random| to end of each line. The random number should never repeat.
Please help with a shell script to process all cdr's in a directory with above requirement. (23 Replies)
Hi everyone
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Hi there,
first of all this is not homework...this is a new type of exercise for practicing vocabulary with my students.
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What i need is to replace a... (15 Replies)