Thank you for the question (1)
Sorry for the imprecision for the question (2) :
Suppose the date frame df
df1 <- data.frame(
Debut =c ( "24/01/1995", "01/05/1997" ,"31/12/1997", "02/02/1995" ,"28/02/1995"
,"01/03/1995", "13/03/1995", "01/01/1996", "31/01/1996") ,
Fin = c ( "30/04/1997", "30/12/1997" ,"31/12/1997", "27/02/1995", "28/02/1995",
"12/03/1995", "30/06/1995", "30/01/1996", "31/01/1996") ,
INDX = c(6,6,6,  11,11,11, 4,  5,5) )


I would like replace df1  by df2

df2 <- data.frame(
Deb  = c("24/01/1995",     "02/02/1995",     "13/03/1995",
"01/01/1996") ,
Fin  = c("31/12/1997", "12/03/1995",     "30/06/1995",
"31/01/1996") )

Explication :
The lines 1, 2 3 of df1 (who have same value of index =6) are replaced by only one line with
value of Debut of df2 = Debut of line 1 of df1
value of Fin of df2 = Fin of line 3 of df1

The lines 4,5,6 of df1 (who have same value of index =11) are replaced by only one line with
value of Debut of df2 = Debut of line 4 of df1
and value of fin of df2 = Fin of line 6 of df1

The line 7 of df1 (who have same value of index =4) are replaced by only one line with
value of Debut of df2 = Debut of line 7of df1
and value of fin of df2 = Fin of line 7of df1
==> No change

The lines 8,9 of df1 (who have same value of index =5) are replaced by only one line with
value of Debut of df2 = Debut of line 8of df1
and value of fin of df2 = Fin of line 9 of df1

df1
       Debut        Fin INDX
1 24/01/1995 30/04/1997    6
2 01/05/1997 30/12/1997    6
3 31/12/1997 31/12/1997    6
4 02/02/1995 27/02/1995   11
5 28/02/1995 28/02/1995   11
6 01/03/1995 12/03/1995   11
7 13/03/1995 30/06/1995    4
8 01/01/1996 30/01/1996    5
9 31/01/1996 31/01/1996    5

         Deb        Fin
1 24/01/1995 31/12/1997
2 02/02/1995 12/03/1995
3 13/03/1995 30/06/1995
4 01/01/1996 31/01/1996
Thank you for your helps
Michel

Le 17/07/2013 19:57, Rui Barradas a écrit :
Hello,

As for question (1), try the following.


y2 <- cumsum(c(TRUE, diff(x1) > 0))
identical(as.integer(y1), y2)  # y1 is of class "numeric"


As for question (2) I'm not understanding it.

Hope this helps,

Rui Barradas

Em 17-07-2013 18:21, Arnaud Michel escreveu:
Hi Arun

I have two questions always about the question of symplify a dataframe

I would like
1)  to transform the vector x1 into the vector y1
x1 <- c(1,1,1,-1000,         1,-1000, 1,1,1,1,1,1,-1000)
y1 <- c(1,1,1,1,                    2,2, 3,3,3,3,3,3,3)


2) to transform the vectors Debut and Fin by taking into account INDX
into the two vectors Deb and Fin
Debut <- c (
"24/01/1995", "01/05/1997" ,"31/12/1997", "02/02/1995" ,"28/02/1995"
,"01/03/1995",
"13/03/1995", "01/01/1996", "31/01/1996", "24/01/1995", "01/07/1995"
,"01/09/1995",
   "01/07/1997", "01/01/1998", "01/08/1998", "01/01/2000",
"17/01/2000","29/02/2000")

Fin <- c (
"30/04/1997", "30/12/1997" ,"31/12/1997", "27/02/1995", "28/02/1995",
"12/03/1995",
"30/06/1995", "30/01/1996", "31/01/1996", "30/06/1995", "31/08/1995",
"30/06/1997",
"31/12/1997", "31/07/1998", "31/12/1999", "16/01/2000", "28/02/2000",
"29/02/2000")

INDX <- c(6,6,6,                    11,11,11, 4,        5,5)


Deb  <- c("*24/01/1995*",     "*02/02/1995*", "*13/03/1995*",
"*01/01/1996*")
Fi n  <-  c("*31/12/1997*", "*12/03/1995*", "*30/06/1995*",
"*31/01/1996*")


       Debut        Fin INDX
*24/01/1995* 30/04/1997    6
01/05/1997 30/12/1997    6
31/12/1997 *31/12/1997*    6
*02/02/1995* 27/02/1995   11
28/02/1995 28/02/1995   11
01/03/1995 *12/03/1995*   11
*13/03/1995* *30/06/1995*    4
*01/01/1996* 30/01/1996    5
31/01/1996 *31/01/1996*    5
................

Thanks for your help



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