Help understanding loop behaviour
Hi email,
If you want what you described, try this:
xx<-read.table(text="COMPANY_NUMBER NUMBER_OF_YEARS
0070837 3
0070837 3
0070837 3
1000403 4
1000403 4
1000403 4
1000403 4
10029943 3
10029943 3
10029943 3
10037980 4
10037980 4
10037980 4
10037980 4
10057418 3
10057418 3
10057418 3
1009550 4
1009550 4
1009550 4
1009550 4",
header=TRUE,stringsAsFactors=FALSE)
xx$I<-NA
xx$J<-NA
row_count<-1
for(row in 1:nrow(xx)) {
if(row == nrow(xx) || xx$COMPANY_NUMBER[row]==xx$COMPANY_NUMBER[row+1]) {
xx$I[row]<-1
xx$J[row]<-row_count
row_count<-row_count+1
} else {
xx$I[row]<-xx$J[row]<-xx$NUMBER_OF_YEARS[row]
row_count<-1
}
}
xx
Like Petr, I am assuming that you want company 10057418 treated the
same as the others. If not, let us know why. I am also adssuming that
the first three rows should _not_ have a "#" at the beginning, which
means that they will be discarded.
Jim
On Fri, Apr 30, 2021 at 1:41 AM e-mail ma015k3113 via R-help
<r-help at r-project.org> wrote:
I am trying to understand how loops in operate. I have a simple dataframe xx which is as follows
COMPANY_NUMBER NUMBER_OF_YEARS
#0070837 3
#0070837 3
#0070837 3
1000403 4
1000403 4
1000403 4
1000403 4
10029943 3
10029943 3
10029943 3
10037980 4
10037980 4
10037980 4
10037980 4
10057418 3
10057418 3
10057418 3
1009550 4
1009550 4
1009550 4
1009550 4
The code I have written is
while (i <= nrow(xx1) )
{
for (j in 1:xx1$NUMBER_OF_YEARS[i])
{
xx1$I[i] <- i
xx1$J[j] <- j
xx1$NUMBER_OF_YEARS_j[j] <- xx1$NUMBER_OF_YEARS[j]
}
i=i + (xx1$NUMBER_OF_YEARS[i] )
}
After running the code I want my dataframe to look like
|COMPANY_NUMBER |NUMBER_OF_YEARS| | I| |J|
|#0070837 |3| |1| |1|
|#0070837 |3| |1| |2|
|#0070837 |3| |3| |3|
|1000403 |4| |1| |1|
|1000403 |4| |1| |2|
|1000403 |4| |1| |3|
|1000403 |4| |4| |4|
|10029943 |3| |1| |1|
|10029943 |3| |1| |2|
|10029943 |3| |3| |3|
|10037980 |4| |1| |1|
|10037980 |4| |1| |2|
|10037980 |4| |1| |3|
|10037980 |4| |4| |4|
|10057418 |3| |1| |1|
|10057418 |3| |1| |1|
|10057418 |3| |1| |1|
|1009550 |4| |1| |1|
|1009550 |4| |1| |2|
|1009550 |4| |1| |3|
|1009550 |4| |4| |4|
I get the correct value of I but in the wrong row but the vaule of J is correct in the first iteration and then it goes to 1
Any help will be greatly appreciated
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