Re: [R] Recursive looping of a list in R

2015-08-09 Thread Gerrit Eichner 

Hi Evans,

not many people (incl. me) are going to guess the building law for your 
recursive structure from the -- in fact at first sight not so clear -- 
picture, but I have some comments inline below.


 Hth  --  Gerrit

I am trying to creat a list from a loop such that once you loop the 
value obtained is appended onto the list, then you loop through that 
value to give the next elemet of the list and the system continues 
recusively. To be clear I am creating a list to contain elements of the 
following tree probabilities; 
http://r.789695.n4.nabble.com/file/n4710898/help.png .
The elements of the diagram should be presented in a list such that each 
level of the tree represents elements in the list (only the coefficients 
are of interest). I have this code to start with



If you use a while-loop without a termination criterion and, e.g., a call 
to break, in its body it would run forever (if the code in its body were 
correct). Start coding with a (finite) for-loop. (Or even better start 
setting j and i by hand and let your code be evaluated step by step.)



j - 0

while(j = 0){

 j - j+1



Here you create in each loop the same starting list (which I guess is not 
what you want/should):



 occlist - list(1)



So, as a consequence an error occurs for j = 2 in the following for-loop, 
because occlist has always only 1 component:



 for(i in occlist[[j]]){

   occ_cell - seq(i, i+1, by = 1)



The following two lines of code compensate each other, so seem to be 
superfluous:



   occllist - list(occ_cell)

   occunlist - as.vector(unlist(occllist, recursive = TRUE))





   occlist[[j]] - occunlist

   print(occlist)

 }
}

Any assistance will be highly appreciated. Thanks.



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Re: [R] Recursive looping of a list in R

2015-08-08 Thread Jim Lemon 
Hi Evans,
I'm not sure whether this is what you want, but look at the code in
the listBuilder and listCrawler functions in the crank package.

Jim


On Sun, Aug 9, 2015 at 4:14 AM, Evans evansochi...@aims.ac.za wrote:
 I am trying to creat a list from a loop such that once you loop the value
 obtained is appended onto the list, then you loop through that value to give
 the next elemet of the list and the system continues recusively. To be clear
 I am creating a list to contain elements of the following tree
 probabilities;
 http://r.789695.n4.nabble.com/file/n4710898/help.png . The elements of the
 diagram should be presented in a list such that each level of the tree
 represents elements in the list (only the coefficients are of interest). I
 have this code to start with

 j - 0

 while(j = 0){

   j - j+1

   occlist - list(1)

   for(i in occlist[[j]]){

 occ_cell - seq(i, i+1, by = 1)

 occllist - list(occ_cell)

 occunlist - as.vector(unlist(occllist, recursive = TRUE))

 occlist[[j]] - occunlist

 print(occlist)

   }
 }

 Any assistance will be highly appreciated. Thanks.



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 http://r.789695.n4.nabble.com/Recursive-looping-of-a-list-in-R-tp4710898.html
 Sent from the R help mailing list archive at Nabble.com.

 __
 R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
 https://stat.ethz.ch/mailman/listinfo/r-help
 PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
 and provide commented, minimal, self-contained, reproducible code.

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R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.