Re: Cumulative mean

[AlbFrigerio]

Francesco, you are right, but my problem is not how to find the cumulative
mean (I forgot the attached file, now you may see it) but only to know if
there is an Octave function which already makes it. As you can see in the
attached file I wrote a code calculating cumulative arithmetic, geometric
and harmonic mean of a vector or of a matrix (really simple, I'm not a
genious ;) ) , I just wanna know if I made something useful or not
(obviously if I could find an Octave function making cumulative means I
would use it!!) .
 
  Alberto


http://n4.nabble.com/file/n2226039/cummean.m cummean.m 


>Looking for something like cummax and cummin , is there a function to
>calculate the cumulative mean of a matrix / vector? I know it's an easy
>program to implement and I already made it on my own (as you may see in the
>attached file) , I just wanna know if there is a standard Octave function,
>which will be probably faster than mine.

I think that this is what you want:

octave> A=magic(4);A=horzcat(A,2*A)
A =

   16    2    3   13   32    4    6   26
    5   11   10    8   10   22   20   16
    9    7    6   12   18   14   12   24
    4   14   15    1    8   28   30    2

octave> cumsum(A)
ans =

   16    2    3   13   32    4    6   26
   21   13   13   21   42   26   26   42
   30   20   19   33   60   40   38   66
   34   34   34   34   68   68   68   68

octave> diag(1./(1:rows(A)))*cumsum(A)
ans =

   16.0000    2.0000    3.0000   13.0000   32.0000    4.0000    6.0000  
26.0000
   10.5000    6.5000    6.5000   10.5000   21.0000   13.0000   13.0000  
21.0000
   10.0000    6.6667    6.3333   11.0000   20.0000   13.3333   12.6667  
22.0000
    8.5000    8.5000    8.5000    8.5000   17.0000   17.0000   17.0000  
17.0000

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