[R] Conditional Evaluation

[Thiem Alrik]

Dear mailing list,

how can I identify all those rows of matrix B which fulfill some condition based on another matrix A? More precisely,

A <- matrix(c(1, 1, 0, 1, -9, 1, -9, 1, 0, 0, 1, 1, 0, -9, 1, 0, -9, 0, 1, 1, 1, -9, 1, 1, 1), ncol = 5, byrow = TRUE)

B <- matrix(c(0,0,1,0,0,0,1,1,0,0,0,0,1,1,0,1,0,1,1,0,0,1,1,1,0,1,1,1,1,0,0,0,1,0,1,1,
0,1,0,1,0,1,1,0,1,1,1,1,0,1,0,0,1,1,1,0,1,1,1,1,1,0,0,1,0,1,0,0,1,1,0,1,0,0,1), ncol = 5, byrow = TRUE)

Row 1 in A has value 1 on element 1, 2 and 4. Which rows in B also display this pattern? Only row 6.
Row 2 in A has value 1 on element 1 and 3. Which rows in B also display this pattern? Rows 4, 6, 8 and 10.
...
Row 5 in A ...

C <- rbind(4, 6, 8, 10, ...)

How can I collect together all those rows from B to create a new matrix C? 

Thanks a lot,

Alrik