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# mmean()

Read（2000） Label: matrix, multidimensional matrix, mean,

Description:

Calculate the mean value within a matrix or a multidimensional matrix.

Syntax:

mmean(A, n)

Note:

An external library function (See External Library Guide) where parameter n is the sequence number of the level on which the summarization is performed. If n is absent, the desired dimension is the first one whose size is not 1 in matrix A.

Parameter:

 A A matrix or a multidimensional matrix n A positive integer

Option:

 @a Calculate the mean on all elements of matrix A and parameter n is invalid

Return value:

A sequence or a number

Example:

 A 1 [[11,12,13],[21,22,23],[31,32,33]] 2 =mmean(A1,1) Calculate mean value on the matrix’s first level – that is, calculate mean on members of each column. 3 =mmean(A1, 2) Calculate mean value on the matrix’s second level – that is, calculate mean on members of each row. 4 =mmean(A1) Calculate mean value on the first level since parameter n is absent. 5 =mmean@a(A1) Calculate mean value on all elements of the matrix. 6 [[[111,112,113],[121,122,123],[131,132,133]],[[211,212,213],[221,222,223],[231,232,233]]] Define a three-dimension matrix whose two members are 3*3 matrices. 7 =mmean(A6, 1) Calculate mean value on matrix A6’s first level, that is, perform the calculation on both of its two member matrices in alignment. 8 =mmean(A6, 2) Calculate mean value on matrix A6’s second level, that is, perform the calculation on each column of each member matrix.