Re: [R] Formula that includes previous row values

2009-02-23 Thread Pele
Hi Greg - this is perfect - Thank You! Also, thanks to everyone for the other suggestions Greg Snow-2 wrote: > > How about: > > x3 <- cumsum( x2* 0.24^(5:0) ) / 0.24^(5:0) > > with the 5 replaced by the length -1 for the more general case. > > -- > Gregory (Greg) L. Snow Ph.D. > Statistic

Re: [R] Formula that includes previous row values

2009-02-23 Thread Greg Snow
How about: x3 <- cumsum( x2* 0.24^(5:0) ) / 0.24^(5:0) with the 5 replaced by the length -1 for the more general case. -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 > -Original Message- > From: r-help-boun...@r-projec

Re: [R] Formula that includes previous row values

2009-02-23 Thread Christos Hatzis
alf Of Pele > Sent: Monday, February 23, 2009 4:48 PM > To: r-help@r-project.org > Subject: Re: [R] Formula that includes previous row values > > > Hi Jorge - many thanks for you suggestion, but I am looking > for a way where I don't have to use a loop. I meant to >

Re: [R] Formula that includes previous row values

2009-02-23 Thread Pele
Hi Jorge - many thanks for you suggestion, but I am looking for a way where I don't have to use a loop. I meant to include that in my description. Thanks again! Jorge Ivan Velez wrote: > > Dear Pele, > Probably not the best way to proceed but it works: > > X<-read.table(textConnection("ID

Re: [R] Formula that includes previous row values

2009-02-23 Thread Jorge Ivan Velez
Dear Pele, Probably not the best way to proceed but it works: X<-read.table(textConnection("ID X2 1.001.00 2.000.00 3.001.00 4.003058 5.000.00 6.006.00"),header=TRUE) closeAllConnections() X x3<-0 for(i in 2:(nrow(X)+1)) x3<-c(x3, X$X2[i-1]+0.24*x3[i-1]) X$x3<-x3[-1]