How to generate normally distributed random numbers ?

randn#opencv

asked 2016-12-23 09:48:18 -0600

azdoud.y
71 ●1 ●2 ●8

updated 2016-12-24 12:02:13 -0600

Dear community,

I'm trying to write a code aims to generate pseudorandom scalar drawn from the standard normal distribution. I have implemented these random functions normal_distribution but I still not getting my expectations.

I need to get this resultat, no matter how it's long :

Would be great to get your help. I appreciate any suggestions Thank you in advance

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Comments

I need them generated with a normal distribution with mean 1 and standard deviation 2 plz

azdoud.y ( 2016-12-23 14:47:35 -0600 )edit

I've wrote this what do you thing

    Size sM(1,1);
    Mat mean(sM,CV_64F), stddev(sM,CV_64F) ,dst(sM,CV_64F);
    mean.at<double>(0,0) = 1;
    stddev.at<double>(0,0) = 2;
    randn(dst, mean, stddev);

azdoud.y ( 2016-12-23 15:12:46 -0600 )edit

You can use this method too :

rng.fill(dst, RNG::NORMAL,1,2)

LBerger ( 2016-12-24 06:42:49 -0600 )edit

@azdoud.y - so, you have an example, above. what exactly, does not suit your needs, here ?

berak ( 2016-12-24 12:09:06 -0600 )edit

with all recpect to @LBerger and @Tetragramm, when I used rng.fill(dst, RNG::NORMAL,1,2) i don't get what I want I got this

[4.546826124191284]
[4.584695339202881]
[1.896207928657532]
[3.372463703155518]
[4.132120847702026]
[2.377070903778076]
[3.775224208831787]
[3.56936526298523]
[2.937457799911499]
[4.62383508682251]
[-1.535781621932983]
[3.329351902008057]
...

in rng.gaussian(sigma) I can't change the mean

azdoud.y ( 2016-12-24 13:00:44 -0600 )edit

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Comments

First thank you a lot, however, No Sir in the page that I linked doesn't make exactly what I want. in OpenCV there is a randn function that hope use it in my case with mean 1 and standard deviation 2

   //! fills array with normally-distributed random numbers with the specified mean and the standard deviation
   CV_EXPORTS_W void randn(InputOutputArray dst, InputArray mean, InputArray stddev);

azdoud.y ( 2016-12-23 11:13:33 -0600 )edit

To change the mean, just add the mean to the output values. And yes, the example in the page does what you need.

Tetragramm ( 2016-12-25 11:55:41 -0600 )edit

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How to generate normally distributed random numbers ?

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How to generate normally distributed random numbers ? edit

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How to generate normally distributed random numbers ?