CODEWITHSUNDEEP
symbolic-mathmaxima
IInatas
IInatas

Reputation: 23

how to calculate the mean value of an incomplete matrix with maxima?

maybe I miss the obvious, but how do I get the mean value of the following matrix ?

matrix( [      ,        ,           ],
        [7.5133,        ,   5.3     ],
        [4.93  , 5.7667 ,   2.9067  ] );

I tried mean, geometric_mean, ... and the other commands from the descriptive package, but they don't work with missing values.

regards, Marcus

Upvotes: 2

Views: 84

Answers (1)

slitvinov
slitvinov

Reputation: 5768

I think one have to implement it. For example

M: matrix(
  [ und  ,      und,   und],
  [7.5133,      und,   5.3],
  [4.93  ,  5.7667 ,   2.9067] ) $

ulength(x):=block([n: 0], matrixmap(lambda([e], if e#'und then n: n + 1), x), n) $
usum(x):=block([s: 0], matrixmap(lambda([e], if e#'und then s: s + e), x), s)    $
umean(x):=usum(x)/ulength(x) $
umean(M);

Upvotes: 1

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