[R] Subset by using multiple values

[Phil Spector]

One possibility would be to paste together the values before
subsetting:

subset(DC2_m,!paste(as.character(X2),X3,sep='\\0') %in% paste(as.character(Exclude_Data$Code),Exclude_Data$Dates,sep='\\0'))

(untested due to lack of a reproducible example).

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu


On Mon, 29 Nov 2010, clangkamp wrote:

>
> Hi
> I would like to extend this item to the following:
> I have the following table
>
>  X1   X2   X3 value
> 1   BVEq AGR 11412 954.75
> 2 CA_Tot AGR 11412 970.59
> ...
>> str(DC2_m)
> 'data.frame':	104160 obs. of  4 variables:
> $ X1   : Factor w/ 62 levels "BVEq","CA_Tot",..: 1 2 3 4 5 6 45 46 47 48
> ...
>  ..- attr(*, "names")= chr  "Figure.1" "Figure.995" "Figure.17873"
> "Figure.17874" ...
> $ X2   : Factor w/ 48 levels "AGR","AKZ","ALB",..: 1 1 1 1 1 1 1 1 1 1 ...
>  ..- attr(*, "names")= chr  "1" "1" "1" "1" ...
> $ X3   : int  11412 11412 11412 11412 11412 11412 11412 11412 11412 11412
> ...
> $ value: num  955 971 NA NA NA ...
>
>
> And I have a second (manual) table with entries of combinations of X2 and X3
> which I want to exclude:
>> str(Exclude_Data)
> 'data.frame':	8 obs. of  2 variables:
> $ Code : Factor w/ 5 levels "ALB","ALQ","BAY",..: 3 3 2 4 5 3 1 2
> $ Dates: int  12052 12233 12508 11960 13056 12142 12691 12783
>
> subset(DC2_m, cbind(X2,X3) %in% Exclude_Data[])
>
> Now the trick is to precisely exclude just the combinations chosen, and not
> all combinations of Exclude_Data[1] and Exclude_Data[2], which is what
> happens when doing two statements "X2 in ED[1]" AND "X3 in ED[3]".
>
> Any takers ? Thanks in advance
> Christian
> -- 
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