[R] Raster table: how separate lines with the same value (count > 1)

[David Winsemius]

On Feb 22, 2010, at 6:40 AM, Simone R. Freitas wrote:

> Dear all,
>
> I intend to do some statistics with my raster table, like  
> correlations or
> regression analysis. For that, I need that each pixel be in one  
> line, that
> is, there is no count > 1. So, all columns should have the same  
> number of
> lines, when I compare (combine) rasters.
>
> I'd like to know if there is a way to create lines and copy the  
> values of
> the lines, when count is > 1. So, even though values were the same,  
> and
> count twice (or more), I need that those values be repeated in  
> different
> lines.
>
> Example:
>
> My raster table now:
>
> COUNT_Forest KTOTAL500X FOREST_BUF
> 1 28006 50
> 1 27953 50
> 1 12726 150
> 2 12725 1
> 1 12722 50
> 1 7600        1
> 2 586      1000
> 10 586        1
>
> My new raster table (the ideal one):
>
> COUNT_Forest KTOTAL500X FOREST_BUF
> 1 28006 50
> 1 27953 50
> 1 12726 150
> 1 12725 1
> 1 12725 1
> 1 12722 50
> 1 7600        1
> 1 586      1000
> 1 586      1000
> 1 586        1
> 1 586        1
> 1 586        1
> 1 586        1
> 1 586        1
> 1 586        1
> 1 586        1
> 1 586        1
> 1 586        1
> 1 586        1
>
 > dta[ rep(row(dta)[ ,1], dta$COUNT_Forest), ]
     COUNT_Forest KTOTAL500X FOREST_BUF
1              1      28006         50
2              1      27953         50
3              1      12726        150
4              2      12725          1
4.1            2      12725          1
5              1      12722         50
6              1       7600          1
7              2        586       1000
7.1            2        586       1000
8             10        586          1
8.1           10        586          1
8.2           10        586          1
8.3           10        586          1
8.4           10        586          1
8.5           10        586          1
8.6           10        586          1
8.7           10        586          1
8.8           10        586          1
8.9           10        586          1

>  After that, I'd like to join tables using KTOTAL500X column. How  
> can I do
> that?
>

?merge


> Thank you very much.
>
> Best regards
>
> Simone.
> --------------------------------------------------
> Simone R. Freitas
> Universidade Federal do ABC (UFABC)
> Centro de Ciências Naturais e Humanas (CCNH)
> R. Catequese, 242
> Bairro Jardim
> 09090-400 - Santo André - SP
> Brasil
> http://srfreitas.webs.com/
>
> 	[[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.