08-06-2009
use $RANDOM and appropriate MOD function.
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1. Shell Programming and Scripting
Hi I want to genrate 10 random 32 bit binary numbers with hamming distance 4 and 8.
11010110010101010101010101010101
11010110010101010100010101010010
if we look carefully at these two binary numbers they differ at 4 places hence hamming distance 4. Now I want to genrate these numbers... (2 Replies)
Discussion started by: hack_tom
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Hi,
How can we generate 16 digit random nos in C. (10 Replies)
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Im new to C, and Im having a hard time getting a random number.
In bash, I would do something similar to the following to get a random number;
#!/bin/bash
seed1=$RANDOM
seed2=$RANDOM
seed3=$RANDOM
SEED=`expr $seed1 * $seed2 / $seed3`
echo ${SEED%.*}
Now, in online examples... (4 Replies)
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I want to generate an awk function that generated a Gaussian distributed set of random numbers. I need to implement the thing below in awk. Rnd is just a uniform random number between 0 and 1
function rgaussian(r1, r2) {
Do
v1 = 2 * Rnd - 1
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Hello.
Could anyone help me with my little annoying problem?
I have to generate a 512 MB file made up with random data using DD. After some internet digging I found out that the command is:
dd if=/dev/urandom of=/exemple/file bs=512MB
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6. Shell Programming and Scripting
Hi there I am trying to generate a random number between 40 and 70 using the shell here is my code so far and it keeps going above 70. all help much appreciated!
comp=$(( RANDOM%70+40 ))
echo $comp (4 Replies)
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Having a hard time with this. Very new to scripting and linux. Spent all sunday trying to do this. Appreciate some help and maybe help breaking down what the syntax does.
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Hi,
How can I generate a string of random characters (alpha+numeric) of a particular length ?
For e.g. for
n=5, output = 'kasjf'
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Thanks (7 Replies)
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Hi Guys and gals...
As you know I am getting to grips with POSIX and hit this stumbling block.
Generating two random numbers 0 to 255 POSIXly. Speed in not important hence the 'sleep 1' command.
I have done a demo that works, but it sure is ugly! Is there a better way?
#!/bin/sh
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LEARN ABOUT DEBIAN
alzabo::sqlmaker::postgresql
Alzabo::SQLMaker::PostgreSQL(3pm) User Contributed Perl Documentation Alzabo::SQLMaker::PostgreSQL(3pm)
NAME
Alzabo::SQLMaker::PostgreSQL - Alzabo SQL making class for PostgreSQL
SYNOPSIS
use Alzabo::SQLMaker;
my $sql = Alzabo::SQLMaker->new( sql => 'PostgreSQL' );
DESCRIPTION
PostgreSQL-specific SQL creation.
METHODS
Almost all of the functionality inherited from "Alzabo::SQLMaker" as is. The only overridden methods are "limit()" and "get_limit()", as
PostgreSQL does allow for a "LIMIT" clause in its SQL.
EXPORTED SQL FUNCTIONS
SQL may be imported by name or by tags. They take arguments as documented in the PostgreSQL documentation (version 3.23.39). The func-
tions (organized by tag) are:
:math
PI
RANDOM
ABD
CEIL
DEGREES
FLOOR
FACTORIAL
SQRT
CBRT
EXP
LN
RADIANS
ACOS
ASIN
ATAN
ATAN2
COS
COT
SIN
TAN
ROUND
TRUNC
LOG
POW
MOD
TO_CHAR
:string
LENGTH
CHAR_LENGTH
CHARACTER_LENGTh
OCTET_LENGTH
TIRM
UPPER
LOWER
INITCAP
ASCII
TO_ASCII
STRPOS
POSITION
TO_NUMBER
TO_DATE
TO_TIMESTAMP
REPEAT
RPAD
LPAD
SUBSTR
:datetime
NOW
CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
TIMEOFDAY
ISFINIT
TIMESTAMP
TO_CHAR
DATE_PART
DATE_TRUNC
EXTRACT
OVERLAPS
:network
BROADCAST
HOST
NETMASK
MASKLEN
NETWORK
TEXT
ABBREV
:aggregate
These are functions which operate on an aggregate set of values all at once.
COUNT
AVG
MIN
MAX
SUM
STDDEV
VARIANCE
:system
These are functions which return information about the Postgres server.
CURRENT_USER
SYSTEM_USER
USER
:control
These are flow control functions:
NULLIF
COALESCE
:misc
These are functions which don't fit into any other categories.
ENCRYPT
ENCODE
DECODE
FORMAT
INET_NTOA
INET_ATON
BIT_OR
BIT_AND
PASSWORD
MD5
LOAD_FILE
:common
These are functions from other groups that are most commonly used.
NOW
COUNT
AVG
MIN
MAX
SUM
DISTINCT
AUTHOR
Dave Rolsky, <dave@urth.org>
perl v5.8.8 2007-12-23 Alzabo::SQLMaker::PostgreSQL(3pm)