 

Hi there,

 

I have a question, which I thought is very easy to solve, but somehow I can't find a solution. Probably someone could help me quickly?

 

Here it is:

 

I have two matrices:

 

a

     [,1] [,2] [,3]

[1,]    1    4    9

[2,]    2    6   10

[3,]    3    6   11

[4,]    4    8   12

 

 

b

     [,1] [,2]

[1,]    1    4

[2,]    2    5

[3,]    3    6

 

Now I want to find out which rows of b can also be found in a (without its last column). So the solution must be something like either "TRUE FALSE TRUE" or the rows where their is a match (rows 1 and 3)

 

Till now I have tried things like b %in% a[,1:2] or so but that doesn't work because I want to compare the WHOLE row of b with the whole row of a without column 3.

 

Thank you very much for any help.

 

Regards, Antje


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