Normal Random number generation

2017 3 9
2 个回答
回答已采纳
更新时间：2017 3 15
2 次查看（30 天）

0 个投票

I want to generate random numbers from a standard normal distribution with decreasing standard deviation that lies between 0 and 1. First, what is meant by decreasing standard deviation? Secondly, randn generates normal distribution random numbers. But how to limit them between 0 and 1?

请先登录，再回答此问题。

 采纳的回答

James Tursa
James Tursa 2017-3-9
编辑：Walter Roberson 2017-3-9

1 个投票

7 个评论
显示 5更早的评论 隐藏 5更早的评论

Rakesh Jain
Rakesh Jain 2017-3-9
But what is meant by decreasing standard deviation
James Tursa
James Tursa 2017-3-9
I don't know. Maybe your professor wants you to make several different runs with various values of standard deviation and then make some conclusions about the results you get. What is the actual wording of the problem you are working?
Rakesh Jain
Rakesh Jain 2017-3-9
编辑：Rakesh Jain 2017-3-9
I had to minimise errror using a optimisation algorithm (BBBC) which I had to code using Matlab. There was a statement :'r' is a random number from a standard normal distribution with decreasing standard deviation
Rakesh Jain
Rakesh Jain 2017-3-9
r lies between 0 and 1
Walter Roberson
Walter Roberson 2017-3-9
I do not seem to find any optimization algorithm abbreviated as BBBC. Perhaps you were referring to Broad Bioimage Benchmark Collection ?
Rakesh Jain
Rakesh Jain 2017-3-15
编辑：Rakesh Jain 2017-3-15

@Walter Roberson, BBBC is Big Bang Big Crunch Optimisation Algorithm by Osman K. Erol and Ibrahim Eksin discovered in 2006

Walter Roberson
Walter Roberson 2017-3-15
Decreasing standard deviation would result in an algorithm with similarities to Simulated Annealing.

请先登录，再进行评论。

更多回答（1 个）

Walter Roberson
Walter Roberson 2017-3-9

1 个投票

My interpretation is that the normal distribution is to be unbounded, not restricted to the range [0 1], but that the standard deviation used is to start and 1 and decrease to 0. For example,
SD = linspace(1, 0, 20)
results = randn(1,20) .* SD
That would give you 20 results with stand deviation decreasing from 1 to 0.
As for why... I don't know?

类别

在 帮助中心 和 File Exchange 中查找有关 Code Performance 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by