You can run multiple regressions at once:
x <- 1:4
y <- x + 10
z <- 0:3
lm(cbind(x,y) ~ z)
Michael
On Wed, May 2, 2012 at 9:48 AM, stella <dorotheabu...@yahoo.de> wrote:
> Hi,
>
> How can a function in R handle different types of input?
> I have written a function, which should calculate the slope from several
> 3-time-point measurements by linear regression
>
> 4 three-time-point-measurements:
> x<-cbind(c(1,2,3,4),c(2,3,4,5),c(3,4,5,6))
>
> time points:
> time<-c(1,3,9)
>
> function for calculating the slope by linear regression:
> fit<-function(xx,t){slope <- coefficients(lm(log(xx) ~ 0 + t))[1]
> return(slope)
> }
> alpha<-fit(x[1,],time)
>
> At the moment the function output 'alpha' is calculated for
> x(x1=1,x2=2,x3=3). I would like to get 'alphas' for all four rows of x
> without using a for-loop. If I use 'mapply', I get outputs to very entry of
> x (12 outputs) instead of four.
>
> Thank you very much in advance! Yor help is really appreciated!
> Stella
>
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/How-can-a-function-in-R-handle-different-types-of-input-tp4603263.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
> 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.
______________________________________________
R-help@r-project.org mailing list
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.
