
hi guys..please help me with this
i am working on two data frames
one goes like this:
DF1
Sample_id RepairHours Denatured Dose ZeroMean FourtyFiveMean NinetyMean
1     SDM071           0         1    B     60.5           19.0       45.0
2     SDM071           1         1    B     46.0           23.0       42.5
3     SDM071           2         1    B     52.5           24.0       40.0
4     SDM071           3         1    B     42.0           21.5       45.0
5     SDM053           0         1    B     66.5           28.5       56.5
6     SDM053           1         1    B     47.0           29.0       47.5
7     SDM053           2         1    B     52.0           31.0       44.0
8     SDM053           3         1    B     36.0           34.0       41.5
9     SDM059           0         1    B     47.5           41.5       29.0
10    SDM059           1         1    B     47.0           36.0       35.0
11    SDM059           2         1    B     41.5           42.0       32.5
12    SDM059           3         1    B     46.5           41.5       32.0


and the other one:
DF2
SampleId RepairHours Denatured Dose_uM Day_0_Read1 Day_0_Read2 Day_45_Read1
8    SDM071           0         1       C         124         120         
108
9    SDM071           0         1      25         123         128          
77
10   SDM071           0         1      50         132         138          
79
11   SDM071           0         1     100         118         116          
68
12   SDM071           0         1     200         125         146          
73
20   SDM071           1         1       C         113         117         
113
21   SDM071           1         1      25         108         115         
132
22   SDM071           1         1      50         105          96          
94
23   SDM071           1         1     100         101         101          
88
24   SDM071           1         1     200         114         106          
89
32   SDM071           2         1       C         143         136         
109
33   SDM071           2         1      25         126         147         
110
34   SDM071           2         1      50         109         122         
107
35   SDM071           2         1     100         114         118          
89
36   SDM071           2         1     200         118         128          
88
44   SDM071           3         1       C         103         111         
116
45   SDM071           3         1      25         108         105         
115
46   SDM071           3         1      50         118          99          
88
47   SDM071           3         1     100          98         103         
105
48   SDM071           3         1     200         112         105          
96
56   SDM053           0         1       C         214         208         
158
57   SDM053           0         1      25         159         214         
178
58   SDM053           0         1      50         170         169         
112
59   SDM053           0         1     100         149         158         
124
60   SDM053           0         1     200         201         171         
115
68   SDM053           1         1       C         149         166         
120
69   SDM053           1         1      25         145         134         
118
70   SDM053           1         1      50         159         169         
130
71   SDM053           1         1     100         113         126         
110
72   SDM053           1         1     200         118         112         
120


these are just part of the frames......
i have to subtract the first five values of dataframe2 from one value from
dataframe1
eg: subtract<-DF2$Day_0_Read1-DF1$ ZeroMean


if u notice the repair hours in both have to match...along with their id's.
i have tried this 
zeroday_subtract1=DF1$Day_0_Read1 - DF2[DF1$RepairHours,]$ZeroMean
but it dosent work


please help me with this...i know its basic but i needhelp  
thx in advance


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