Hello 

I have two data frames, SNP4 and SNP1: 

> head(SNP4) 
          Animal     Marker        Y 
3213 194073197  P1001 0.021088 
1295 194073197  P1002 0.021088 
915   194073197  P1004 0.021088 
2833 194073197  P1005 0.021088 
1487 194073197  P1006 0.021088 
1885 194073197  P1007 0.021088 

> head(SNP1) 
           Animal    Marker x 
3213 194073197  P1001 2 
1295 194073197  P1002 1 
915   194073197  P1004 2 
2833 194073197  P1005 0 
1487 194073197  P1006 2 
1885 194073197  P1007 0 

I want these two data frames merged by 'Marker', but when i try 

> SNP5 <- merge(SNP4, SNP1, by = 'Marker', all = TRUE) 
Error: cannot allocate vector of size 2.4 Gb 
In addition: Warning messages: 
1: In merge.data.frame(SNP4, SNP1, by = "Marker", all = TRUE) : 
  Reached total allocation of 1535Mb: see help(memory.size) 
2: In merge.data.frame(SNP4, SNP1, by = "Marker", all = TRUE) : 
  Reached total allocation of 1535Mb: see help(memory.size) 
3: In merge.data.frame(SNP4, SNP1, by = "Marker", all = TRUE) : 
  Reached total allocation of 1535Mb: see help(memory.size) 
4: In merge.data.frame(SNP4, SNP1, by = "Marker", all = TRUE) : 
  Reached total allocation of 1535Mb: see help(memory.size) 

And error occurs. 

What i want is the column SNP1$x merged together with SNP4 by Marker, so some
markers will have NA's in the 'x'-column in the SNP5 dataset. 

I also tried this 

> SNP5 <- merge(SNP4, SNP1$x, by.x = 'Marker', by.y = 'Marker', all = TRUE) 
Error in fix.by(by.y, y) : 'by' must specify valid column(s) 

I won't work either. 

Does anyone have any idea how to solve this. 

Regards, 

Johannes. 

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