Questions tagged [random-number-generator]
The random-number-generator tag has no usage guidance.
58
questions
0
votes
2
answers
210
views
Random Number Formula needed
I need your help. I want to generate a series of Random numbers(min 1000 numbers).
format is: XG123456789J01 ( XG 123456789 J01) XG and J are permanent in numbers.
I am very confused about how to ...
- 3
0
votes
1
answer
255
views
Does RNGD accept other entropy input with Debian11, kernel Debian-5.10.0-17?
Aug 06, 2022
I upgraded to the Debian-5.10.0-17-amd64 kernel recently and was not impressed. I regressed back to the Debian-5.10.0-9-amd64 kernel.
Under the '9' kernel, I run a script that cat's ...
0
votes
3
answers
1k
views
Excel RAND incrementing numbers
I have two numbers in excel a min and max and I want to fill in a random number between those two numbers but it must increase each time
thinking something like
INT(RAND()+C3)
and c3 has a value of ...
- 281
0
votes
0
answers
1k
views
How do I get real random in CMD?
I have some script which every PC in network download and execute, and the task is NOT to run script simultaneously. So, I used simple pseudo-random for timeout like
TIMEOUT /T 2%random:~0,2%
But as ...
- 11
1
vote
3
answers
930
views
Will two RAND() functions in the same formula produce two separate random numbers?
I am reviewing someone else's work without them being easily able to answer. The formula below should not produce results less than zero as it is related to a physical quantity that cannot be negative....
- 13
0
votes
0
answers
70
views
Why do we use pseud-random numbers when we have access to truly random numbers easily? [duplicate]
Is there any reason except being able to reproduce the same sequence of numbers, for using pseudo-random number generators while there is easy access to truly random numbers such as the number of ...
- 113
0
votes
1
answer
175
views
Run two function inside a loop in VBA
I have this formula for creating random number =DEC2HEX(RANDBETWEEN(100,1000),8) in my excel sheet. But I want to convert it to vba.
After a lot of hassle I came to this :
ActiveSheet.Range("A&...
- 84
0
votes
2
answers
2k
views
vba code for generating unique number in a column's cell serially
I created a button in my excel sheet. Now I want that every time I click on that button an unique code will be generated in a cell. Again if I click on that button another unique code will be ...
- 84
3
votes
1
answer
2k
views
How reliable is the randomness of the shuf command?
I ran the following command to generate 1 billion random numbers:
time shuf -i 1-1000000000 > "SHUF TEST 1"
To my surprise it was able to do this in less than 10 mins. I then ran the ...
- 12.8k
0
votes
1
answer
169
views
Can the “/dev/random” device be edited to make the RNG predictable on my computer? [closed]
Is it possible, with super user access, to edit my /dev/random or /dev/urandom in such a way that even OS-generated random numbers are predictable?
I am trying to understand if I sent an executable (e....
- 363
0
votes
0
answers
68
views
convert decimal random values to binary for ent testing
I have ascii random values from /dev/urandom in a file like:
435
678
437
897
They are uniformly distributed and have perfect average. feeding the file to ent test suite yields low entropy value and ...
- 99
1
vote
1
answer
148
views
Generating (pseudo) random numbers from a log file (eg. /var/log/maillog)
First: I really know that a true random number generator should have real random input, like something that is impossible to predict.
Now, consider this: A busy mail-server can generate tens of ...
- 161
19
votes
4
answers
28k
views
Can't load /root/.rnd into RNG : where can I find it, or how to create it?
I'm trying to setup a VPN server with OpenVPN, on an Ubuntu Server 18.04, and I want to use EasyRSA to build my PKI CA.
So, while connected as root, I launch the EasyRSA scripts which I copied to /etc/...
- 333
-4
votes
1
answer
50
views
Entering a random number sequence seed under surveillance [closed]
I'm trying to transmit a continuous sequence of random numbers from my computer over to another country (for validation purpose). This sequence is a series of pseudo random numbers recursively ...
- 123
52
votes
2
answers
11k
views
dd is producing a 32 MB random file instead of 1 GB
I wanted to produce a 1 GB random file, so I used following command.
dd if=/dev/urandom of=output bs=1G count=1
But instead every time I launch this command I get a 32 MB file:
<11:58:40>$ dd ...
- 591
2
votes
0
answers
844
views
Configure the default Random Number Generator algorithm in Windows.
How do I configure the default random number generator on Windows? Windows 7 and above.
I would like to check whether the "Dual Elliptic Curve Deterministic Random Bit Generator (Dual EC DRBG)" ...
- 193
0
votes
1
answer
2k
views
RANDBETWEEN but smaller than another cell value
I would like to generate a number that is random but smaller than the cell above (I'm doing 4th grade subtraction worksheet).
What is the formula for this?
I tried =randbetween(C3, 99) but it didn'...
- 1
-2
votes
1
answer
71
views
Excel formula Help: Random sequence number
Would like to seek assistance for excel formula for difference between two or more numbers . In this sample if i put value randomly in cell G2 is there formula to put generate random number between ...
- 3
0
votes
1
answer
47
views
TrueRNG Pseudo GUI Issues - Collision
I am trying to create a Pseudo GUI for the TrueRNG Hardware using RNGCapture.exe and a custom Batch Based Menu. The RNGCapture program is only command line and a Royal Pain to create Multiple Entropy ...
5
votes
1
answer
663
views
Play random movie/episode within a folder from its context menu
The Goal
I have a relatively expansive media collection stored locally on my machine within two parent folders ("Movies" and "Shows"). My goal is to be able to play at random any one of the movies or ...
- 12.8k
-1
votes
1
answer
5k
views
Auto generate unique number with no duplicate
How can I auto generate number if 1 of the column is fixed with the number that I want and another column randomly generate the number that is not in first column? I do not want any duplicate.
For ...
0
votes
0
answers
384
views
Unable to plot a scatter plot in excel
I have taken integers from 1 to 100 as my total population set. Now I generated 5 random numbers (using =randbetween() command) and called it my sample 1. Similarly, I created 200 such samples. Now I ...
- 73
3
votes
1
answer
1k
views
Biased Random results in Excel
Over on WorldBuilding we like to play with science-fictiony themes, including "what if there were more that two sexes" (examples here, here, here). All good clean fun and, I thought, a chance for me ...
- 163
15
votes
3
answers
3k
views
How often does /dev/urandom sample seeding from /dev/random?
Unless I am totally confused and it doesn't do that.
I want to know whether or not /dev/urandom will gain increased entropy if I take a hardware RNG and plug its entropy into /dev/random.
So to ...
Vasili Mahin
1
vote
1
answer
656
views
cat /dev/random brings up print dialog
I was just messing around and in the terminal of my Mac I did cat /dev/random just to watch the endless stream of random values. It has now brought up a print dialog and it wants to print half a page ...
- 133
2
votes
1
answer
2k
views
What AMD processors provide RDRAND?
The latest AMD programmer manuals, dated June 2015, include the RDRAND instruction in the instruction set. Confer, AMD64 Architecture Programmer’s Manual Volume 3: General-Purpose and System ...
- 12.1k
6
votes
1
answer
2k
views
Should I use “/dev/random” or “/dev/urandom” for large random data needs? [duplicate]
Sometimes I want a lot of highly-random data, for example to overwrite a file or even a whole hard disk. Should I use /dev/random or /dev/urandom? What are the advantages or disadvantages of each? Is ...
- 6,254
3
votes
1
answer
6k
views
Why am I constantly running out of entropy?
So I've been trying to create a new GPG key, and keep getting this well-known error:
Not enough random bytes available. Please do some other work to give
the OS a chance to collect more entropy! (...
-2
votes
2
answers
2k
views
\/?' was unexpected at this time error in batch file
I am trying to integrate a password generator into my batch file so that it generates multiple passwords.
Unfortunately it give the following error:
\/?' was unexpected at this time.
The expected ...
- 29
2
votes
2
answers
643
views
Random selection with a caveat / criteria
I have a 6 x 6 grid. I have 36 samples split into three equal groups (A, B, and C).
I want a formula to arrange the samples in that grid randomly. However each row and each column must contain two of ...
- 21
4
votes
3
answers
2k
views
How do computers generate random numbers
This may very well be the only question I ever ask on this stackexchange site. In programming there are many different ways to generate random numbers depending on different languages. What has been ...
- 173
0
votes
1
answer
2k
views
How do I generate random numbers between a range in cells? [duplicate]
I'm wanting to create a button that generates a string of 10 random numbers into cells, and pulls the range for these random numbers from, for instance, in B1 and B2. Basically, I'm looking to use the ...
- 1
1
vote
1
answer
965
views
Not quite grasping /dev/random and /dev/urandom
I am not quite understanding the difference between /dev/random and /dev/urandom on Linux systems.
What does it mean to run out of “entropy” and how does the system get more?
What does it mean when ...
- 461
0
votes
1
answer
2k
views
How to generate inverted normal random numbers in VBA?
I am trying to generate 5.000 random variables using these excel functions: normsinv(rand()). This is the code I wrote:
Dim r As Integer
r = 1
For r = 1 To 5001
.Cells(r + 1, 1) = Application....
- 1
0
votes
2
answers
4k
views
Random Numbers in a Range of Cells
I want to generate random numbers in my model. Every time I run the macro my cells range "G8:H34" have to fill in with different random numbers that should be integers from 0 to 2.
I have to ...
- 21
1
vote
1
answer
602
views
How do computers generate random numbers? [closed]
How does a computer generate 'random' numbers?
How close to truly 'random' can a number generated by a computer actually be?
Is there software / programming language out that that might generate a ...
- 199
14
votes
7
answers
31k
views
Creating a large file of random bytes quickly
I want to create a large file ~10G filled with zeros and random values. I have tried using:
dd if=/dev/urandom of=10Gfile bs=5G count=10
it creates a file of about 2Gb and exits with a exit status 0....
- 261
13
votes
3
answers
152k
views
How to keep random numbers from changing in Excel?
I am trying to generate a set list of random numbers between 1 and 5 using the RANDBETWEEN formula.
I'm running into a problem that every time I click another cell anywhere in the sheet or even open ...
- 281
686
votes
18
answers
83k
views
How are pseudorandom and truly random numbers different and why does it matter?
I've never quite got this. Just say you write a small program in any language at all which rolls some dice (just using dice as an example). After 600,000 rolls, each number would have been rolled ...
4
votes
1
answer
3k
views
Is reading from /proc/sys/kernel/random/entropy_avail draining entropy?
When I'm doing watch cat /proc/sys/kernel/random/entropy_avail, the amount of entropy steadily decreases, until I get about 150-200. Initially I get over 2000. When I stop reading that value and wait ...
- 254
0
votes
1
answer
2k
views
Excel VBA: Rnd() method isn't random enough
I'm using Excel and VBA to simulate a large number of dice rolls.
The problem I'm having is after a certain period of time, the rolls start repeating, and I start getting results that are anything ...
- 1
2
votes
2
answers
3k
views
Randomly reorder pages in PDF document
I'm looking for a series of commands to randomize the order of pages in an existing PDF document.
- 385
21
votes
3
answers
29k
views
Why does `cat /dev/urandom` break your terminal?
In reference to this question: https://serverfault.com/questions/534449
How does cat /dev/urandom make some terminal emulators go wonky?
- 1,427
0
votes
2
answers
30k
views
MS Excel: Unique random number generator within a range
I searched for a similar question but couldn't find one..
I want to generate 10 groups out of numbers ranging from 1-60 (including both), with each and every group containing random and non-repeating ...
user235376
3
votes
1
answer
1k
views
Calculating mean of value across random trials/refreshes in Excel?
Say I have a 1000 cells filled with random values and a particular cell that computes a final answer based on those 1000 values. Now I wish to track the value of the answer over 1000 trials i.e., I ...
- 349
1
vote
4
answers
1k
views
What's the best way to get a random(ish) sequence of printable/alphanumeric characters?
I know I can get random (well, pseudo-random) characters, unconstrained, from '/dev/random' (or /dev/urandom). But what if I need these characters to generate a filename? I need to somehow have a ...
- 9,503
16
votes
3
answers
8k
views
How can I know whether my machine have RNG hardware support?
I came across a blog concerning entropy pool problem and learn that there are a special hardware called RNG. I have read this kernel RNG page but I still wonder whether there is a way to find out if ...
- 303
-1
votes
3
answers
869
views
Random Number in Linux
In linux /dev/random is based of "environmental variables" and /dev/urandom is based off an algorithm and the time. My questions are:
Where does /dev/random gather these variables from.
And if you ...
- 8,268
5
votes
3
answers
8k
views
how to record mic input and pipe the output to another program
Hi everyone Im trying to follow a tutorial on generating truly random bits
How To Generate Truly Random Bits
This is the command from the tutorial but it does not work
rec -c 1 -d /dev/dsp -r 8000 -...
- 51
6
votes
3
answers
1k
views
How to generate random numbers with a .wav file?
I want to generate random numbers within a certain range (1 to 26) using a .wav file with only static noise.
The results need to be repeatable.
Is there any service/program/method of accomplishing ...
- 772