Hello everyone,
I would like to create a "dynamic" array to keep storing number in it
for (i in c(2:length(final))){
myarray <-final[i]-final[i-1]
myarray2<-2*final[i]
}
At the end I would like to use myarray as the x values of an array
and the myarray2 as the yvalues of the same array.
I tried cbind but it didnot work.
Could you please help me with that?
Best Regards
Alex
[[alternative HTML version deleted]]
Hello Alex.
I'm a bit confused by your english, but what I guess you want is:
x<-final[-1] - final[-length(final)]
y<-2*final[-1]
result<-cbind(x=x, y=y)
Good luck.
Nick Sabbe
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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On
Behalf Of Alaios
Sent: woensdag 27 oktober 2010 16:38
To: Rhelp
Subject: [R] keep adding elements to the matrix
Hello everyone,
I would like to create a "dynamic" array to keep storing number in it
for (i in c(2:length(final))){
myarray <-final[i]-final[i-1]
myarray2<-2*final[i]
}
At the end I would like to use myarray as the x values of an array
and the myarray2 as the yvalues of the same array.
I tried cbind but it didnot work.
Could you please help me with that?
Best Regards
Alex
[[alternative HTML version deleted]]
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On Oct 27, 2010, at 10:37 AM, Alaios wrote:> Hello everyone, > I would like to create a "dynamic" array to keep storing number in it > > > for (i in c(2:length(final))){ > myarray <-final[i]-final[i-1] > myarray2<-2*final[i] > }Because there are no indices on the left hand side of those assignments, you are just overwriting those values. If you want myarray and myarray2 to actually be vectors, (or matrices or arrays), then you need to create them with the proper dimension(s) and then index them when assigning into them.> > At the end I would like to use myarray as the x values of an array > and the myarray2 as the yvalues of the same array.Perhaps myarray <- matrix(NA, nrow=length(final)-1, ncol=2) myarray[ , 1] <- diff(final) myarray[ , 2] <- 2*final[2:length(final)]> I tried cbind but it didnot work. > > Could you please help me with that?David Winsemius, MD West Hartford, CT