On Sat, Sep 01, 2012 at 02:29:40AM -0700, Andras Farkas wrote:
> Dear All,
> ?
> is there a way to set low and high limits to a simulation with rlnorm()?
> ?
> as an example:
> ?a <-rlnorm(500,0.7,1)
> ?
> ?
> I get the summary of
> ?
> Min. 1st Qu. Median Mean 3rd Qu. Max.
0.1175 1.0590 2.1270 3.4870 4.0260 45.3800
>
> I would like to set limits so that the simulated values minimum would be
> greater then 0.5 and maximum of less than 30. If during simulation a
> value?outside of the limits would be simulated, then I would like R to "throw
> that value out" and go back to generate another random number instead that
> would fit the limits criteria.
Hi.
If you want to generate one number at a time, try this
while (1) {
a <- rlnorm(1, 0.7, 1)
if (0.5 < a && a < 30) break
}
If you want to generate a vector and avoid a loop over its components,
try something like the following
n <- 500
while (1) {
a <- rlnorm(2*n, 0.7, 1)
a <- a[0.5 < a & a < 30] # only one & here
if (length(a) >= n) break
}
a <- a[1:n]
Hope this helps.
Petr Savicky.
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