On 06/28/2016 03:03 AM, Mohammad Tanvir Ahamed via R-help wrote:
Can any one please help me. I will apply this for a very large list, about 400k
vector in a list and vector size is unequal and large
Example :
Input:
a <- c(1,3,6,9,25,100)
b<-c(10,7,20,2,25)
c<-c(1,7,5,15,25,300,1000)
d<-list(a,b,c)
Expected outcome :
# When looking for 1 in d
c(1,3)
# When looking for 7 in d
c(2,3)
# when looking for 25 in d
c(1,2,3)
# When looking for 50 in d
NULL or 0
Make a vector of queries
queries = c(1, 7, 25, 50)
Create a factor of unlist(d), using queries as levels. Create a vector
rep(seq_along(d), lengths(d)), and split it into groups defined by f
f = factor(unlist(d, use.names=FALSE), levels=queries)
split(rep(seq_along(d), lengths(d)), f)
Martin Morgan
Thanks in advance !!
Tanvir Ahamed
Göteborg, Sweden | mashra...@yahoo.com
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