mersennetwister | pure JavaScript implementation of the Mersenne | Runtime Evironment library
kandi X-RAY | mersennetwister Summary
kandi X-RAY | mersennetwister Summary
The Mersenne Twister is a pseudo-random number generator invented by Makoto Matsumoto in 1997. Details can be found on the Wikipedia page and on Matsumoto's website. This implementation is based on Sean McCullough's port of the original C code written by Makato Matsumoto and Takuji Nishimura. Improvements over Sean's version are. Please note that the mersenne twister is not cryptographically secure.
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Trending Discussions on mersennetwister
QUESTION
I have some code that I use a (old) Mersenne Twister header file with to get a good pseudo-random number generator.
The problem is that that code uses the register
keyword which (as far as I understand) was deprecated in c++11
and throws an error with c++17
. I believe I am using the latter in the version of clang
I'm using on Mac OSX (10.14.6; Mojave).
The Makefile I am using is as thus:
...ANSWER
Answered 2021-Oct-20 at 03:15@MadScientist and @idz were correct above. The key was that the root libraries when using root-config --cflags --glibs
added the following:
QUESTION
Below is a class which uses the @Configuration annotation to create a Bean. I am slowly introducing Spring into a legacy Java application. I don't want to Spring-ify everything all at once - that would be crazy. I thought I'd start with one of the commonly used utility classes and I don't want Spring to create Beans for the three fields below (Enumerator, RandomDataGenerator, AliasMethodFactory). How do I turn off Autowiring for those fields? Spring is currently complaining that it can't find Beans for those (it's obviously trying to auto-wire them).
...ANSWER
Answered 2021-Oct-04 at 17:06Seperate the class for the Bean and the Configuration of the Bean. Like this
QUESTION
I am trying to "skip forward" a few realizations by using the function Future.randjump(), but it doesn't seem to behave as I expect it to. The following code gives me the desired result, where jumping forward 1 steps gives the same result as if I had called rand(rng)
twice, i.e. the two println display the same number:
ANSWER
Answered 2021-Mar-04 at 13:15One unit of randjump
corresponds to generation of two floating point numbers.
Consider this example
QUESTION
I have a Julia code, and I want to submit this code to a remote computing cluster via running a large number of jobs in parallel (i.e., around 10,000 jobs in parallel). The way this code works is that, the main function (call it "main.jl") calls another function (call it "generator.jl") which utilizes random numbers such as rand(Float64) and so on. I submit main.jl via a bash file, and I run N jobs in parallel by including
...ANSWER
Answered 2021-Jan-13 at 22:54There are two issues here:
- Getting the job number
- Using the job number in random number generation.
Each of those issues has two solutions - one more and other less elegant but also OK.
Ad.1.
For managing job numbers consider using PBS together with ClusterManagers.jl
. There is a command there addprocs_pbs(np::Integer; qsub_flags="")
that will make it possible to manage the run numbers and orchestrate the cluster from within Julia. In many scenarios you will find this approach more comfortable. Here you can use for seeding the random number generator (more on that later) myid()
that returns the worker number. Anyway most likely you will in this scenario run your computations using the @distributed
loop and you can use that value for seeding RNG.
If you are rather orchestrating array jobs externally via bash scripts then perhaps the best thing is to pass the job number via a parameter to the Julia process and read it from ARGS
variable or have a setup bash script that exports an environmental parameter that can be read from ENV
variable.
Ad.2.
There are two approaches here. Firstly you can simply create a new MersseneTwister at each worker and then use it in the streams. For an example (here I assume that you use some variable jobid
):
QUESTION
I am currently attempting to run my code in parallel. Part of my code (genetic algorithm) relies on the selection of random numbers. Therefore, I need to make sure that each thread used, have their own random number generator. I must also be able to replicate the results. Therefore, I have "borrowed" a function, which has the ability to set a random seed or create specific seeds for each thread.
In order to test if this was working correctly, I wanted to set the seeds equal for each thread and test to see if the same random numbers were generated. However, this was not the case!
I believe that I am missing something fundamental about the generation of the numbers. When creating the random number generators, I have used the same UInt32
. I believe that they should therefore draw the same numbers, however the randjump
may interfere with this. Perhaps the random number generators do not "jump" forward to the same point/state to ensure that each is far enough from each other in the cycle. Perhaps they share a state when doing it this way? Is there a way to control if the implementation is accurate? Perhaps there is a bigger error at play here?
ANSWER
Answered 2020-Nov-24 at 01:59You basically do not need to use randjump
because the MersenneTwister
streams are not correlated.
Hence, the standard way to initiate the random streams for threads is the following:
QUESTION
I've been trying to figure out how to suppress the output of the last line in Jupyter Notebook with Julia. In particular, when the last line is an assignment. In Jupyter Notebook with a Python kernel, when I do
...ANSWER
Answered 2020-May-17 at 08:06Ok I figured it out. The output can be disabled by simply appending a semicolon at the end of the last statement. A cell with
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