[R] how to calculate the average values of each row in a matrix

[R. Michael Weylandt <michael.weylandt@gmail.com>]

On Jul 19, 2013, at 20:19, Elaine Kuo <elaine.kuo.tw at gmail.com> wrote:

> Hello,
> 
> I have a matrix (class matrix) composed of GridCell (row and column).
> The matrix value is the beta diversity index value between two grids.
> 
> Now I would like to get the average value of each GridCell.
> Please kindly advise how to make the calculation.
> Thank you.
> 

Perhaps the rowMeans() function?

MW

> Elaine
> 
> The matrix looks like (cited from Michael Friendly)
> I would like to get the average value of each color.
> 
> 
>      Obs  stim   RPur   Red   Yel   Gy1   Gy2  Green  Blue  BlP  Pur1
> Pur2
> 
>                      1  RPur     .     .     .     .     .      .     .
> .     .     .
>                      2  Red    11.5    .     .     .     .      .     .
> .     .     .
>                      3  Yel    13.1   6.0    .     .     .      .     .
> .     .     .
>                      4  Gy1    12.6   7.9   6.2    .     .      .     .
> .     .     .
>                      5  Gy2    10.6   8.4   8.4   5.2    .      .     .
> .     .     .
>                      6  Green  10.6   9.4   9.9   6.5   4.1     .     .
> .     .     .
>                      7  Blue   10.8  10.2  10.3   8.8   7.0    6.4    .
> .     .     .
>                       8  BlP     7.3  11.3  12.7  11.2  10.4    9.9   4.2
>  .     .     .
>                       9  Pur1    5.4  11.5  12.9  11.7  10.8    9.4   8.4
> 4.5    .     .
>                      10  Pur2    5.0  11.5  10.7  10.2  10.6   10.1   8.1
> 6.4    3     .
> 
>    [[alternative HTML version deleted]]
> 
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