Hi R-users,
I create a simple code to check out how often the same numbers in y occur in
x. For example 5000000 320000 occurs two times.
But the code with the loop is extremly slow. x have 6100 lines and y
sometimes more than 50000 lines.
Is there any alternative code to create with R?
thanks.
x
5000000 3200000 0
5100000 3100000 0
5200000 3100000 0
5200000 3200000 0
lengthx <- length(x[,1])
y
5000000 3200000 1
5000000 3200000 1
5200000 3100000 1
5200000 3000000 1
langthy <- length(y[,1])
for (i in 1:lengthx){
for (j in 1:lengthy){
if (x[i,1] == y[j,1]){
if (x[i,2] == y[j,2]){
x[i,3] <- x[i,3] + 1
}
}
}
}
x
1 5000000 3200000 2
2 5100000 3100000 0
3 5200000 3100000 1
4 5200000 3200000 0
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