zones.sum {smerc} | R Documentation |
zones.sum
computes the sum of y
for the
indices in each element of the list contained in zones
.
zones.sum(zones, y)
zones |
A list of nearest neighbors in the format
produced by |
y |
A numeric vector of values to be summed over. |
A numeric vector.
# show nn.cumsum example for a circular scan setting data(nydf) coords = with(nydf, cbind(longitude, latitude)) cases = floor(nydf$cases) zones = scan.zones(coords, pop = nydf$pop, ubpop = 0.1) # compute cumulative sums over all nn szones = zones.sum(zones, cases) # compute cumulative sums over just the first set of nn szones2 = sapply(zones, function(x) sum(cases[x])) # check equality all.equal(szones, szones2)