[R] Confusing piece of R code

B77S bps0002 at auburn.edu
Sat Jul 9 23:15:11 CEST 2011

Have you looked at the manual for any of these? 

#and so on...

Bazman76 wrote:
> m0<-epxression((4*theta1*theta2-theta3^2)/(2*x*theta3^2)-0.5*theta1*x)
> params<-all.vars(m0)                              this reads all the
> params from m0 so theta1,2 and 3 correct?
> params<-params[-which(params=="x")]      checks which params are
> multiplied by x?
> np<-length(params)                                
> for(i in 1:6){
> esp<-get(sprintf("m%d",i-1))                    what does get do? sprinf
> formats strings? so what is it doinf here?
> assign(sprintf("m%d",i),D(esp,"x"))             what doeas assign so what
> in sprintf doing and what does D do?
> }
> really really confused?

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