uniform distribution between a and b with intervals of 0,005

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Alexandra 2016-11-25

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评论： Alexandra 2016-11-28

Hi,

I am having trouble using R = unidrnd(N) to create n random numbers between a and b (imagine a=0 and b=0.2) where the numbers generated are always a multiple of 0,005. For example: 0,005 0,1 0,15 0,0155 ...

Thanks a lot,

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Alexandra 2016-11-25

Thanks a lot for the help. I will use tic toc to check which way is faster as the model is very heavy.

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Answer 1

Guillaume 2016-11-25

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How about generating uniform integers between 0 and 0.2/0.005 and multiplying the whole lot by 0.005

R = randi([0 0.2/0.005], 1, 1000) * 0.005; %generate 1000 numbers in multiple of 0.005 between 0 and 0.2

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Answer 2

Image Analyst 2016-11-25

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Alexandra, try this:

numValues = 20; % However many elements you want.
a=0.1;
b = 0.2;
% Get max integer value for randi.
topValue = floor((b-a)/0.005)
% Scale to make values go from a to b.
R = a +  0.005 * randi(topValue, 1, numValues)

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Alexandra 2016-11-28

This solution is close to uniform but never takes value zero (a), which is important.

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Answer 3

dpb 2016-11-25

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Well, I'd guess so...that wouldn't be very random at all...but, the simple-minded approximation would be

>> N=10;
>> n=rand(N,1)*0.2;
>> n=(n*1000-mod(n*1000,5))/1000
n =
  0.0950
  0.1600
  0.0250
  0.0800
  0.1800
  0.1550
  0.1900
  0.1300
  0.0050
  0.1650
>>