I am trying to optimize a bit of code, and am puzzled about information from summaryRprof(). In particular, it looks like a number of calls are made to external C programs, but I'm not able to pin down which C program, from which R function. I am planning to resolve this through a bunch of slicing and dicing of the code, but wondered if I am overlooking some better way to interpret the profiling data.
The highest-consuming function is .Call, which is apparently a generic description for calls to C code; the next leading functions appear to be assignment operations:
$by.self
self.time self.pct total.time total.pct
".Call" 2281.0 54.40 2312.0 55.14
"[.data.frame" 145.0 3.46 218.5 5.21
"initialize" 123.5 2.95 217.5 5.19
"$<-.data.frame" 121.5 2.90 121.5 2.90
"as.vector" 110.5 2.64 416.0 9.92
I decided to focus on the .Call to see how this arises. I looked through the profiling file to find those entries with .Call in the call stack, and the following are the top entries in the call stack (by count of # of appearances):
13640 "eval"
11252 "["
7044 "standardGeneric"
4691 "<Anonymous>"
4658 "tryCatch"
4654 "tryCatchList"
4652 "tryCatchOne"
4648 "doTryCatch"
This list is as clear as mud: I have <Anonymous> and standardGeneric in there.
I believe this is due to calls to functions in the Matrix package, but that's because I'm looking at the code and that package appears to be the only possible source of C code. However, a lot of different functions from Matrix are called in this package, and it seems very difficult to determine which function is consuming this time.
So, my question