Dear List,
I am a beginner of R and have an easy question, which I couldnt find out.
I like to exclude all rows of matrix y from matrix x (like a subset of
x, without y).
The matrix x is of the structure
>str(x)
num [1:346, 1:8] 0.055 0.6833 0.9121 0.0819 0.1223 ...
- attr(*, "dimnames")=List of 2
..$ : chr [1:346] "10357" "10815" "10829" "10885" ...
..$ : chr [1:8] "ua_mfb" "ua_mivh" "ua_mukh" "ua_schwh" ...
The matrix y is a subset of x
> str(y)
num [1:301, 1:8] 0.683 0.912 0.832 0.833 1 ...
- attr(*, "dimnames")=List of 2
..$ : chr [1:301] "10815" "10829" "12049" "13960" ...
..$ : chr [1:8] "ua_mfb" "ua_mivh" "ua_mukh" "ua_schwh" ...
Now I need a matrix w of all rows of x, which are not included in y.
w seems to obtain the dimension nrow=45, ncol=8
Example:
I have a matrix x:
> x <- matrix(1:21,ncol=3)
> rownames(x) <- c("a","b","c","d","e","f","g"); colnames(x) <-
c("V1","V2","V3")
> x
V1 V2 V3
a 1 8 15
b 2 9 16
c 3 10 17
d 4 11 18
e 5 12 19
f 6 13 20
g 7 14 21
And the subset y:
y <- x[-c(1,3,5,7),]
> y
V1 V2 V3
b 2 9 16
d 4 11 18
f 6 13 20
Now I like to exclude all rows from x, which are included in y. The result
has to be:
> w
V1 V2 V3
a 1 8 15
c 3 10 17
e 5 12 19
g 7 14 21
I tried it with:
l <- rownames(y)
> w <- x[-c(get(l)),]
Fehler in get(l) : Objekt 'b' nicht gefunden
But R couldnt find object b.
So I tried it with a loop:
> l <- rownames(y)
> w <- NULL
> for(i in l)
+ w[i] <- x[-(l),]
Fehler in -(l) : ungültiges Argument für unären Operator
But R returned: Error in (l): argument invalid
I also started experiments with get(paste()), merge, match() and subset(),
but I couldnt solve the problem jet.
I would be very thankfull for a hint (->command) or a solution.
Thanks in advance, Henning!
hennin...@gmx.de
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