matrix merge problem

An embedded and charset-unspecified text was scrubbed...
Name: not available
URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20090414/ba951be9/attachment-0001.pl>
Hi Juan,

Your first question can be answered easily.

bin.matrix = matrix(A %in% B,nrow(A),ncol(A)) ;
bin.vector = rowSums(bin.matrix) > 0 ;
C = A[bin.vector,] ;

This should do the trick.

Cheers,

Luc
Dear r-help contributors,

I have two questions:

first:

I have a matrix A and a vector B.
I want to make a new matrix C, which is made of the rows of A having a value
included in B.

Second:

I have two matrixes A and B, of different dimensions.
B has unique values in column 2 and A has not unique values on column 2.
I want to merge this two matrixes by the values in the columns 2 of B and 2
of A in such a way that the resulting matrix will be C:

A:

1 2
2 2
3 3
4 3
5 4
6 4
7 5
8 5

B:

1 2  x c d
2 3  y f  g

C:

1 2  x c d
2 2  x c d
3 3  y f  g
4 3  y f  g
5 4 NA NA
6 4 NA NA
7 5 NA NA
8 5 NA NA

Can you help me?

Many thanks in advance.

	[[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.