[R] slower execution in R 1.9.0

[Scott Bartell]

I have an R function (about 1000 lines long) that takes more than 20
times as long to run under R Windows 1.9.0 and 1.8.1 than it does under
1.7.1.  Profile results indicate that the $<-.data.frame operation is
the culprit, but I don't understand exactly what that is (assignment of
data frame elements to another variable?), or why it's only a problem
under 1.8.1 and 1.9.0.  Any advice?   


top 5 operations under 1.9.0
               self.time self.pct total.time total.pct
$<-.data.frame    110.64     93.3     110.68      93.3
FMD                 5.38      4.5     118.60     100.0
DIRinf              0.54      0.5      11.82      10.0
INDinf              0.46      0.4       9.78       8.2
pweibull            0.38      0.3       0.38       0.3
  
top 5 operations under 1.7.1
                       self.time self.pct total.time total.pct
pweibull                    2.62     55.7       2.62      55.7
^                           0.76     16.2       0.76      16.2
CalcDistance                0.16      3.4       1.26      26.8
FMD                         0.16      3.4       4.70     100.0
matrix                      0.14      3.0       0.14       3.0


- Scott Bartell