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Questions - random

[Python - scipy]: Genarate random samples from custom multivariate Probability Density Function (PDF)

I want to generate random sample (vector X): X = [x1, x2, x3, ..., x_d] where X follows a custom multivariate Probability Density Function. I am using Python - scipy and I overvide the PDF function t...
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vasilis siatras

python

random

scipy

probability-distribution

Votes: 0

Answers: 1

Latest Answer

That is because the the rvs method that your class inherits (i.e. that of multivariate_normal_gen) uses an instance of multivariate_normal_gen directly that is declared outside of the class definition...
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aafsar

Random number generation problem with meta table

Please look at the next code, Lua. randomNumber = { new = function(self,o) o = o or {} setmetatable(o, self) self.__index = self return o end, math.randomseed(os.time()), getNum = ...
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user3886365

random

lua

metatable

Votes: 0

Answers: 2

Latest Answer

Let's take a look at your table constructor randomNumber = { new = function(self,o) -- this assigns a function to randomNumber["new"] o = o or {} -- that will return a new i...
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Piglet

I would like to know how how to generate random numbers with a specific normalized distribution funtion

Basically, if my distribution function is f(v)= NormalDistribution(-u,sigma)+ NormalDistribution(u,sigma) How do I define f as a PDF, normalize it and then apply some random variate command to my PDF?...
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divica

python

random

Votes: 0

Answers: 1

Latest Answer

Well, you have sum of two normalized Gaussian, f(x) = N(x|μ,σ) + N(x|-μ,σ) ∫ f(x) dx = 1 + 1 = 2 PDF(x|μ,σ) = N(x|μ,σ)/2 + N(x|-μ,σ)/2 Because PDF is symmetric, sampling is simple: select one gaussian...
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Severin Pappadeux

SQL Select random rows partitioned by a column

I have a dataset looks like this | Country | id | ------------------- | a | 5 | | a | 1 | | a | 2 | | b | 1 | | b | 5 | | b | 4 | | b | 7 | | c ...
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lwu29

sql

random

Votes: 0

Answers: 1

Latest Answer

This should work: select Country, id from (select Country, id, row_number() over(partition by Country order by rand()) as rn from table_name ) t where Country in ('a', 'c') and rn <= 2 Replace ra...
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Zakaria

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