Nothing
inverse.cdf.weights = function(weights, uniforms=runif(length(weights)), engine="R")
{
check.weights(weights)
check.weights(uniforms)
engine=pmatch(engine, c("R","C"))
if (is.unsorted(uniforms)) uniforms = sort(uniforms)
n.samples = length(uniforms)
switch(engine,
{
# R implementation
ids = integer(n.samples)
cusum = cumsum(weights)
index = 1
for (i in 1:n.samples)
{
found = FALSE
while (!found)
{
if (uniforms[i] > cusum[index])
{
index = index + 1
}
else
{
found = TRUE
}
}
ids[i] = index
}
return(ids)
},
{
# C implementation
out = .C("inverse_cdf_weights_R",
as.integer(length(weights)),
as.double(weights),
as.integer(n.samples),
as.double(uniforms),
id=integer(n.samples))
return(out$id)
})
}
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