[R] Subset by using multiple values

[clangkamp]

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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