[R] Confusing piece of R code

[Bazman76]

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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