Visit Our UNIX and Linux User Community


Help with generate a pair of random number


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Help with generate a pair of random number
# 1  
Old 01-19-2016
Help with generate a pair of random number

Hi,

Is anybody experience generate a pair of random number by using awk command?
I wanna to generate a pair of random number (range from 1 to 4124) and repeats it 416 times.

Desired output
Code:
2 326
123 1256
341 14
3245 645
.
.
.

I did write the below command:
Code:
awk "BEGIN{srand($RANDOM); for(i=1;i<416;i++)print int(1+ rand()*4124)}"
1013
4078
2606
2086
1019
373
.
.

But it only able to generate a single random number (range from 1 to 4124) and repeats it 416 times.

I wish to generate a pair of random number (range from 1 to 4124) and repeats it 416 times.
Thanks for any advice.
# 2  
Old 01-19-2016
Hello perl_beginner,

Could you please try following and let me know if this helps you.
Code:
awk 'BEGIN{j=4124;for(i=1;i<=4124;i++){A[i]=i;B[i]=j;j--};for(k in A){print A[k] OFS B[k];c++;if(c>=416){exit}}}'

Code above will show output of both columns differently but one shouldn't expect like each time output will be different from previous run of command, hope it helps. If you have any queries or you have further requirement request you to please provide in details statement.

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
# 3  
Old 01-19-2016
OSX 10.7.5, default terminal using 'sh'.
Try:-
Code:
#/bin/sh
for n in {1..416}
do
	echo "$(( ( $RANDOM % 4124 ) + 1 )) $(( ( $RANDOM % 4124 ) + 1 ))"
done

This User Gave Thanks to wisecracker For This Post:
# 4  
Old 01-19-2016
You're not too far off! Try
Code:
awk "BEGIN{srand($RANDOM); for(i=1;i<416;i++)print int(1+ rand()*4124), int(1+rand()*4124)}"
1931 3259
1456 1559
150 357
.
.
.

This User Gave Thanks to RudiC For This Post:
# 5  
Old 01-19-2016
You guy are awesome and very experience in coding Smilie
Many thanks.

It really help me a lot ^.^

---------- Post updated at 09:12 AM ---------- Previous update was at 09:12 AM ----------

Awesome code Smilie

---------- Post updated at 09:12 AM ---------- Previous update was at 09:12 AM ----------

It worked fine Smilie
Hehe.

---------- Post updated at 09:13 AM ---------- Previous update was at 09:12 AM ----------

Thanks.
It is fantastic Smilie
# 6  
Old 01-19-2016
In case you would like to do something similar in Perl.

Code:
perl -le 'for(1..416){printf "%4d %4d\n", int(rand(4124))+1, int(rand(4124))+1}'

Code:
1046  261
  16 2900
2676  494
1137 2638
   6 3165
3141  584
  73 2299
3430   70
2056 2279
1343 3486
2688  274
2582 3591
 699  411

Added a bit of formatting

Previous Thread | Next Thread
Test Your Knowledge in Computers #579
Difficulty: Easy
A string is a disordered sequence of characters.
True or False?

10 More Discussions You Might Find Interesting

1. OS X (Apple)

Generate a random number in a fully POSIX compliant shell, 'dash'...

Hi all... Apologies for any typos, etc... This took a while but it didn't beat me... Although there are many methods of generating random numbers in a POSIX shell this uses integer maths and a simple C source to create an executable to get epoch to microseconds accuracy if it is needed. I take... (8 Replies)
Discussion started by: wisecracker
8 Replies

2. Shell Programming and Scripting

Need to generate a file with random data. /dev/[u]random doesn't exist.

Need to use dd to generate a large file from a sample file of random data. This is because I don't have /dev/urandom. I create a named pipe then: dd if=mynamed.fifo do=myfile.fifo bs=1024 count=1024 but when I cat a file to the fifo that's 1024 random bytes: cat randomfile.txt >... (7 Replies)
Discussion started by: Devyn
7 Replies

3. UNIX for Dummies Questions & Answers

how to generate random number as as the first column of a txt file

Dear all, I have a question. I have a txt file say 4000 rows X 1800 Column. I 'd like to creat a new column as the first column which is a column of random numbers (n=4000) thanks a lot! Lin (2 Replies)
Discussion started by: forevertl
2 Replies

4. Shell Programming and Scripting

Unix random number generate in given range

Hi All, I have extracted some report from database for few activities done. Now I have a requirement to add some random time(In range of 10-35) in front of each activity. Can be generated random numbers in any bash/sh shell within a given number range, let's say in between 10-30. ... (10 Replies)
Discussion started by: gr8_usk
10 Replies

5. Programming

Generate random number

I saw this formula to generate random number between two specified values in shell script.the following. $(((RANDOM%(max-min+divisibleBy))/divisibleBy*divisibleBy+min)) Give a example in book. Generate random number between 6 and 30.like this. $(((RANDOM%30/3+1)*3)) But I have a... (1 Reply)
Discussion started by: luoluo
1 Replies

6. Programming

Generate Random Password in C

I need a function to generate a random alphanumeric password in C code. It needs to be between 6-8 characters and follow the following rules: Reject if same char appears # time: 4 or more Reject if same char appears consecutively: 3 or more I have the following random password working for... (2 Replies)
Discussion started by: vjaws
2 Replies

7. Shell Programming and Scripting

generate random number in perl

Could any one tell how can I generate random number from (0, 100..200) in perl? Thanks! (2 Replies)
Discussion started by: zx1106
2 Replies

8. Shell Programming and Scripting

Generate a random password

Hello All... Can someone help me generate a random password which will be 7 characters long which contains alpha-numeric characters using shell script. I am looking to store the output of the script that generates the password to a variable within a script and use it as the password. ... (5 Replies)
Discussion started by: chiru_h
5 Replies

9. Shell Programming and Scripting

generate random number in korn shell

I want to be able to generate a random number within a korn shell script.. Preferably i would like to be able to state how many digits should be in this random number... ie 4 digits or 5 digits etc Any ideas? (2 Replies)
Discussion started by: frustrated1
2 Replies

10. Programming

How to generate a random number?

How to generate a random integer with specific range(for example, from 1 to 1000)? Also, how to convert a floating point number into a integer? (2 Replies)
Discussion started by: MacMonster
2 Replies

Featured Tech Videos