Displaying 1 result from an estimated 1 matches for "tc_c".
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ac_c
2011 Jul 19
1
Measuring and comparing .C and .Call overhead
...sec\n")
cat(".Call - Time measured in C++: ", round(tCall_c,2), "sec\n")
cat(".Call - Implied overhead: ", round(tCall_R,2) - round(tCall_c,2), "sec
-> per call: ", 1000000*(round(tCall_R,2) - round(tCall_c,2))/N, "usec\n")
# measuring .C
tC_c <- 0.0
t1 <- proc.time()[3]
for (i in 1:N) {
tC_c <- tC_c + .C("matvecMultiply2", as.double(A), as.double(x),
double(c(m)), as.integer(c(m)), as.integer(c(n)), t = double(1))$t
}
tC_R <- proc.time()[3] - t1
cat(".C - Time measured in R: ", round(tC_R,2), "sec\n...