[R] Help understanding loop behaviour

[PIKAL Petr]

Hi

Your code is hardly readable as you used HTML formating (not recommended) so
I used another (split) approach.

Third column seems to be simple 

#make list
lll <- split(as.factor(COMPANY_NUMBER), COMPANY_NUMBER)

#calculate sequences
as.numeric(unlist(lapply(lll, function(x) 1:length(x))))
should give you third column

The second column seems to be calculated this way.
lapply(lll, function(x) c(rep(1, length(x)-1), max(length(x))))

I believe others could come with simpler solutions.

BTW why result for
10057418 
Should be different?

Cheers
Petr

> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of e-mail
> ma015k3113 via R-help
> Sent: Thursday, April 29, 2021 5:41 PM
> To: r-help using r-project.org
> Subject: [R] Help understanding loop behaviour
> 
> 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
> 	[[alternative HTML version deleted]]
> 
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