Look at sqldf package, it is easier to do sql like statements with it.
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Jul 25, 2010, at 6:10 PM, harsh yadav wrote:
Hi,
I am trying to execute the following SQL statement using two data
frames:
tab1, tab2 : Two Tables
Select tab1.*, tab2.*, tab1.tobiiTime - tab2.ruiTime as timeDiff,
IFNULL(n-m, -9999999) as alwaysIncrement
FROM tab1
LEFT OUTER JOIN tab2 On tab1.data1 - tab2.mouseX = 0 And tab1.data2 -
tab2.mouseY = 0
I am trying to do the following in R:-
*#Getting error here:*
data <- merge(tab1,tab2, all.x=TRUE, by=(data$data1 - data$mouseX ==
0),
by=(data$data2 - data$mouseY == 0))
data <- cbind(data, data[, "tobiiTime"] - data[, "ruiTime"], data[,
"n"] -
data[, "m"])
#Change name of column tobiiTime-ruiTime to timeDiff, for convenience
data <- rename(data, c(tobiiTime-ruiTime="timeDiff"))
#Change name of column n-m to alwaysIncrement, for convenience
data <- rename(data, c(n-m="alwaysIncrement"))
*In the merge step, I want to include the following condition of
merging:-*
tab1.data1 - tab2.mouseX = 0 And tab1.data2 - tab2.mouseY = 0
Any ideas how this could be done.
Thanks in advance.
Regards,
Harsh Yadav
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