score:0
that's an easy one! :)
pseudo code:
data = []
for each region
for each centre
data.push(one data object like {region: "...", ...})
c = crossfilter(data)
r = c.dimension(function returning region name)
g = r.group(string)
allregionshist = g.top(infinity)
for each allregionshist
construct one column
Source: stackoverflow.com
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