Nothing
local(envir=.PBSmodEnv,expr={
locale = sys.frame(sys.nframe() - 1) # local environment
# ***********************************************************
# fib2.C:
# Compute Fibonacci numbers iteratively using a .Call()
# call to C code
# Arguments:
# n - final nth fibonacci number to calculate
# len - length of output vector with previous fibonacci numbers
# -----------------------------------------------------------
fib2.C <- function(n=defaultN, len=defaultLen)
{
retArr <- numeric(len)
out <- .Call("fib2", as.integer(n), as.integer(len))
return(out)
}
# ***********************************************************
# fib2.R:
# A native R version of fib2.C, used for comparison
# Arguments:
# n - final nth fibonacci number to calculate
# len - length of output vector with previous fibonacci numbers
# -----------------------------------------------------------
fib2.R=function(n=defaultN, len=defaultLen){
if (n<0) return(NA)
if (len>n) len <- n
retArr <- numeric(len)
xa=0; xb=1; xn=-1;
for(i in 0:n){
if(i <= 1)
xn=i
else{
xn=xa+xb
xa=xb
xb=xn
}
j=i-n+len
if(j>=0)
retArr[j]=xn
}
return(retArr)
}
#initialization for testing
fib2.init=function(){
defaultN <- 200; tput(defaultN)
defaultLen <- 10; tput(defaultLen)
}
}) # end local scope
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