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Gamma mean and variance


[M,V] = gamstat(A,B)


[M,V] = gamstat(A,B) returns the mean of and variance for the gamma distribution with shape parameters in A and scale parameters in B. A and B can be vectors, matrices, or multidimensional arrays that have the same size, which is also the size of M and V. A scalar input for A or B is expanded to a constant array with the same dimensions as the other input.

The mean of the gamma distribution with parameters a and b is ab. The variance is ab2.


[m,v] = gamstat(1:5,1:5)
m =
   1   4   9  16  25
v =
   1   8  27  64  125

[m,v] = gamstat(1:5,1./(1:5))
m =
   1   1   1   1   1
v =
  1.0000  0.5000  0.3333  0.2500  0.2000

Introduced before R2006a

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