[R] using apply
Neha Aggarwal
@gg@rw@lneh@2000 @ending from gm@il@com
Wed May 2 21:28:03 CEST 2018
Hi
I have 3 dataframes, a,b,c with 0/1 values...i have to check a condition
for dataframe a and b and then input the rows ids to datframe c . In the if
condition, I AND the 2 rows of from a and b and then see if the result is
equal to one of them.
I have done this using a for loop, however, it takes a long time to execute
with larger dataset..Can you help me do it using apply function so that i
can do it faster?
a
V1.x V2.x V3.x V1.y V2.y V3.y
1 1 1 0 1 0 1
2 1 0 1 1 0 1
3 1 1 1 1 0 1
4 0 0 0 1 0 1
b
V1 V2 V3 V4 V5 V6
1 1 0 1 1 0 0
2 1 0 1 0 0 0
c
x y
1 2 1
2 2 2
3 3 1
4 3 2
for(i in 1:nrow(a)){
for(j in 1:nrow(b)){
if(all((a[i,]&b[j,])==b[j,]))
{ c[nrow(c)+1, ]<-c(paste(i,j)
}
}
}
Thanks,
Neha
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