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

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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]]

______________________________________________
R-help at r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
vec = matrix(data=round(rnorm(15,1,2)),ncol=3)
vec
[,1] [,2] [,3]
[1,]    1    1   -1
[2,]    6    2   -1
[3,]    0    0    2
[4,]    0   -3   -2
[5,]    1    1    2
rowMeans(vec)
[1]  0.3333333  2.3333333  0.6666667 -1.6666667  1.3333333
apply(vec,1,mean)
[1]  0.3333333  2.3333333  0.6666667 -1.6666667  1.3333333

may be this helps

GT
________________________________________
De : r-help-bounces at r-project.org [r-help-bounces at r-project.org] de la part de R. Michael Weylandt <michael.weylandt at gmail.com> [michael.weylandt at gmail.com]
Date d'envoi : samedi 20 juillet 2013 03:33
? : Elaine Kuo
Cc : r-help at stat.math.ethz.ch
Objet : Re: [R] how to calculate the average values of each row in a matrix

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]]

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

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