View source: R/poisson_binomial.R
1 | poisson_binomial(theta)
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theta |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | ##---- Should be DIRECTLY executable !! ----
##-- ==> Define data, use random,
##-- or do help(data=index) for the standard data sets.
## The function is currently defined as
function (theta)
{
N <- length(theta)
if (N == 0)
return(c(1))
alpha <- matrix(-Inf, N + 1, N + 1)
alpha[1, 1] <- 1
for (n in 1:N) {
tot = 0
alpha[n + 1, tot + 1] = alpha[n, tot + 1] * (1 - theta[n])
if (n > 1) {
for (tot in 1:(n - 1)) {
alpha[n + 1, tot + 1] <- alpha[n, tot] * theta[n] +
alpha[n, tot + 1] * (1 - theta[n])
}
}
tot = n
alpha[n + 1, tot + 1] = alpha[n, tot] * theta[n]
}
alpha[N + 1, 1:(N + 1)]
}
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