[R] Problem when index is given by a changing formula in loop - BUG??

[greatest.possible.newbie]

Dear community,

I have a little problem filling in a vector with loop output.
I think the problem is the following: I am caluclating the index which
indicates where the loop output should be placed at by a formula. But when I
want to fill in or read out some specific index places this doesn't work
properly. Let me show you my code:

# CODE
################
ln_0 <- 0
ln_max <- 20
ln_schritt <- 0.1
l_frak_0 <- 25
g_l_frak_0 <- 0.5
ln_auslastung <- 2

l_frak <- rep(0, 1+(ln_max-ln_0)/ln_schritt)
ln <- ln_0

while (ln < (ln_max+ln_schritt))
{
  insert <- 1+ (ln-ln_0)/ln_schritt
  l_frak[insert] <-  100
#l_frak_0 / g_l_frak_0 + floor(ln/ln_auslastung) * l_frak_0/g_l_frak_0 *
(1-g_l_frak_0)  -  l_frak_0 * (1-g_l_frak_0) * ln
# for simplification I replace the real formula by 100  

  ln <- ln + ln_schritt
}
names(l_frak) <- seq(ln_0, ln_max, ln_schritt)
#names(l_frak) <- c(1:length(l_frak))
l_frak[which(l_frak[]==0)]
# 0.7  1.2 18.9 
#  0    0    0
# The places in the vector where the filling in doesn't work: 
# 8   13   190

# Now try the following:
#################
ln <- 0.7
insert <- 1+ (ln-ln_0)/ln_schritt
insert
# [1] 8
# BUT:
l_frak[insert]
# 0.6
#  10
# But it should yield
l_frak[8]
# 0.7
#   0
#########
# END CODE

When I change the mode of the variable "insert" to numeric this doesn't
change anything. When I change it to
as.numeric(as.character(1+ (ln-ln_0)/ln_schritt))
Then the place where the filling in doesn't work is at
9.9 or at the 100th
place of the vector.

Is this a bug??

Thank you for your help,
Daniel 


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