[R] match in dependence of 2 columns

[Mat]

Hello,

i want to match a column of one data.frame to another, my problem is, that i
only want to match the data, if 2 columns are equal.

i have a example:

data.frame1
                  cu.nr.         name              value
A                 1                 Evo                 100
B                 1                 Mer                 80
C                 2                 Ford                50

And now i want to match the value to data.frame 2 in dependence of cu.nr.
and name.

data.frame2
                  cu.nr.         name         
A                 33                 Evo              
B                 1                 Mer             
C                 1                 Pold              

as you can see, there is only one row with equal cu.nr. and name. How can i
match the data as desired?
The solution has to look like this one:

                  cu.nr.         name          Value
A                 33                 Evo              
B                 1                 Mer           80  
C                 1                 Pold       

thanks.

Mat



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