[R] conditional Dataframe filling

[arun]

Hi,
You could try:
dat1<- read.table(text="
a    b    c    d
TRUE  TRUE  TRUE  TRUE
FALSE FALSE FALSE TRUE
FALSE  TRUE  FALSE  FALSE
",sep="",header=TRUE)
dat2<-dat1
 dat2[]<-t(apply(1*!dat1,1,function(x) unlist(lapply(split(x,cumsum(c(0,abs(diff(x))))),cumsum))))
 dat2
#  a b c d
#1 0 0 0 0
#2 1 2 3 0
#3 1 0 1 2
A.K.


----- Original Message -----
From: Camilo Mora <cmora at dal.ca>
To: r-help at r-project.org
Cc: 
Sent: Wednesday, March 27, 2013 4:31 AM
Subject: [R] conditional Dataframe filling

Hi everyone:

This may be trivial but I just have not been able to figure it out.

Imagine the following dataframe:
a     b     c     d
TRUE  TRUE  TRUE  TRUE
FALSE FALSE FALSE TRUE
FALSE  TRUE  FALSE  FALSE

I would like to create a new dataframe, in which TRUE gets 0 but if false then add 1 to the cell to the left. So the results for the example above should be something like:

a     b     c     d
0     0     0     0
1     2     3     0
1     0     1     2

I wonder if you may know?.

Thanks,

Camilo




Camilo Mora, Ph.D.
Department of Geography, University of Hawaii
Currently available in Colombia
Phone:   Country code: 57
         Provider code: 313
         Phone 776 2282
         From the USA or Canada you have to dial 011 57 313 776 2282
http://www.soc.hawaii.edu/mora/

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