setwd("C:/Documents and
Settings/Administrator/Desktop/Coursera/specdata/specdata")temp=list.files(pattern="*.csv")myfiles=lapply(temp,read.delim)summk=0nummk=0for
(i in 1:10) { vb=data.frame(myfiles[i]) vbm=as.double(vb)
summk=sum(vbm[,2]) nummk=length(vbm[,2]) - sum(is.na(vbm[,2]))}
Aditya
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