[R] insert values based on common ID

[emorway]

Forum,

with the datasets a and b below, I'm trying to establish a relationship
based on the common column "week" and insert the value from the column
weekAvg in b to the column weekAvg in a.  The dataset a is several thousand
lines long.  I've tried looking at 'match', writing functions, 'rbind.fill'
and various search terms in this forum to no avail.  Thanks...

a<-read.table(textConnection("row ID date Reading WellID week weekAvg
1 Well_80-2 6/12/2000 2:00 -202.034 80-2 0 NA
2 Well_80-2 6/12/2000 3:00 -201.018 80-2 0 NA
3 Well_80-2 6/12/2000 4:00 -199.494 80-2 0 NA
4 Well_80-2 6/12/2000 5:00 -197.716 80-2 0 NA
5 Well_80-2 6/12/2000 6:00 -190.858 80-2 0 NA
6 Well_80-2 6/12/2000 7:00 -181.460 80-2 0 NA
7 Well_80-2 6/19/2000 10:00 -166.728 80-2 1 NA
8 Well_80-2 6/19/2000 11:00 -167.490 80-2 1 NA
9 Well_80-2 6/19/2000 12:00 -167.490 80-2 1 NA
10 Well_80-2 6/19/2000 13:00 -167.490 80-2 1 NA
11 Well_80-2 6/19/2000 14:00 -168.506 80-2 1 NA
12 Well_80-2 6/19/2000 15:00 -168.506 80-2 1 NA"),header=T)
closeAllConnections() 

b<-read.table(textConnection("week weekAvg  
0 -147.3726
1 -181.3429
2 -151.7208
3 -188.8653
4 -163.7465
5 -161.6873
6 -158.5168
7 -146.6136
8 -175.4351
9 -100.9450
10 -151.3655
11 -125.8975
12 -162.5993"),header=T)
closeAllConnections() 


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