Questions tagged [random]
Questions about random number generation and the properties of numbers so generated.
920 questions
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Eigenvectors of GSE with right properties
I encountered a weird problem when trying to study a few properties of eigenvectors of matrices sampled from the Gaussian symplectic ensemble (GSE). I have encountered this while trying to understand ...
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RandomPoint on discretized surface not working
This used to work before but apparently not in version 14.3
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Construction of RMT Hamiltonian with given potential
It is well known that the Random Matrix Theory (RMT), the potential function for the Gaussian ensembles, is
$V(H) = \frac{1}{2} H^2 \quad \Rightarrow \quad P(H) \propto e^{-\frac{N}{2} \operatorname{...
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Generate PSD matrices with a condition
There is this highly upvoted but unanswered post at Math.SE. I would like to try some ideas. This requires numerical experiments with Hermitian and positive definite matrices $A$, $B$, and $C$ such ...
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Fast partial shuffling?
I need a version of partial shuffling of a 2D table of reals tab that works very efficiently for large arrays and, being repeated $N\gg 1$ times, becomes analogous ...
- 6,063
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Generating random Hamiltonian cycle
I need random Hamiltonian cycles in directed graphs. I guess for me it would be OK to mean by that choosing uniformly randomly from the set of all Hamiltonian cycles. ...
- 2,459
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Stochastic Differential Equation with delay
Good day to everyone.
I would like to find a solution of a stochastic differential equation that includes some sort of a delay. But the procedures like ...
- 51
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Random Password Generator question
How to generate password
Re the above post. I am a beginner. I wish to know if I can restrict the random words chosen to a specific length.. for e.g. 6-lettered words. The generated word may look like,...
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Statistical measures for a list of dates
How do I calculate statistical measures such as Mean, Median, StandardDeviation for a list ...
- 63k
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Different speed of RandomInteger depending on syntax?
Consider the two commands:
RandomInteger[3, 10^7]; // RepeatedTiming
RandomInteger[{1, 3}, 10^7]; // RepeatedTiming
The first executes by a factor of 3 faster than ...
- 6,063
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246
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Something faster than RandomReal and RandomInteger?
I am dealing with the code sequentially producing random numbers and using them further for some operations.
The code snippet looks like
...
- 6,063
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Simulating data from a piecewise pdf occasionally returns an error [duplicate]
In the following code, I generate data from a piecewise PDF. Usually, I get a sample size of ns, but sometimes I get an error message:
Error: RandomVariate::unsdst:...
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RandomInteger function to create a list of 10 elements with either Red or Yellow color element [closed]
While following the docs on RandomInteger, it seems mostly covering operations on integers.
But RandomInteger should be applied on other data types such as color as well.
Could anyone please suggest ...
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RandomVariate sometimes returns the input instead of the numbers
Bug introduced in v14.1 and fixed in 14.2.
I have a series of functions that eventually are combined to form a probability distribution function:
...
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