What is the difference between mvnrnd and normrnd?

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Mr M. 2015-5-13

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回答： Adnane123 2015-9-18

采纳的回答： Rohit Jain

I can not find out what is the difference between these two random number generator functions.

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Rohit Jain 2015-5-15

mvnrnd() is the function used to generate pseudo random numbers that follow multi variate normal distribution. mvnrnd() is more for creating correlated random variables normrnd() is the function used to generate pseudo random numbers that follow normal distribution. normrnd() is generally faster than mvnrnd(). For more information on mvnrnd() and normrnd() follow the documentation http://www.mathworks.com/help/stats/mvnrnd.html

http://www.mathworks.com/help/stats/normrnd.html

Adnane123 2015-9-16

编辑：Adnane123 2015-9-16

Another difference to emphasize here is that if you want to use mvnrnd() for the univariate case you should use the variance directly. For normrnd(), you need to use the standard deviation. Thus, the input for each function should look like: mvnrnd(mean,var) Vs normrnd(mean,sd)

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Answer 1

Rohit Jain 2015-5-15

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mvnrnd() is the function used to generate pseudo random numbers that follow multi variate normal distribution. mvnrnd() is more for creating correlated random variables normrnd() is the function used to generate pseudo random numbers that follow normal distribution. normrnd() is generally faster than mvnrnd(). For more information on mvnrnd() and normrnd() follow the documentation http://www.mathworks.com/help/stats/mvnrnd.html

http://www.mathworks.com/help/stats/normrnd.html

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Answer 2

Adnane123 2015-9-18

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Another difference to emphasize here is that if you want to use mvnrnd() for the univariate case you should use the variance directly. For normrnd(), you need to use the standard deviation. Thus, the input for each function should look like: mvnrnd(mean,var) Vs normrnd(mean,sd)