################################################################################
plot.bifd<-function(x,argvals.s,argvals.t,...){
if (missing(argvals.s)){
nfine.s = max(c(201,10*x$sbasis$nbasis+1))
argvals.s = seq(x$sbasis$rangeval[1],x$sbasis$rangeval[2],len=nfine.s)
}
if (missing(argvals.t)){
nfine.t = max(c(201,10*x$tbasis$nbasis+1))
argvals.t = seq(x$tbasis$rangeval[1],x$tbasis$rangeval[2],len=nfine.t)
}
tt<-list(argvals.s,argvals.t)
rtt<-list(x$sbasis$rangeval,x$tbasis$rangeval)
plot(fdata(eval.bifd(argvals.s,argvals.t,x),tt,rtt,fdata2d=TRUE),... )
}
################################################################################
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