Nothing
"simm.brown" <- function(date=1:100, x0=c(0,0), h = 1, id="A1", burst=id)
{
class(date) <- c("POSIX","POSIXct")
y0 <- x0[2]
x0 <- x0[1]
n <- length(date)
dt <- c(diff(unclass(date)),NA)
dx <- c(rnorm(n-1,0,sqrt(dt[-n])*h),NA)
dy <- c(rnorm(n-1,0,sqrt(dt[-n])*h),NA)
x <- c(x0, x0+cumsum(dx[-n]))
y <- c(y0, y0+cumsum(dy[-n]))
res <- as.ltraj(data.frame(x,y),date, id, burst, typeII=TRUE)
return(res)
}
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