[R] SAS to R

[trekvana]

Hi everyone I dont know how to code in SAS but I do know how to code in R.
Can someone please be kind enough to translate this into R code for me:

proc mixed data = small method = reml;
 class id day;
 model weight = day/ solution ddfm = bw;
 repeated day/ subject=id type = unstructured;
run;

===================

so far i think it is
gls(weight~day,corr=corSymm(???),method="REML",data=small)

my main problem is I dont know how to get the unstructured covariance matrix
to work

Thank you
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