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Luiz-N/gist:b1a00dc612274fc36cad

Created July 16, 2014 14:43
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gistfile1.txt
`averageValues = (dim,attr) ->
reduceAddAvg = (attr) ->
(p,v) ->
++p.count
p.sum += +v[attr]
p.avg = p.sum/p.count
p
reduceRemoveAvg = (attr) ->
(p,v) ->
--p.count
p.sum -= +v[attr]
p.avg = p.sum/p.count
p
reduceInitAvg = () -> {count:0, sum:0, avg:0}
dim.group().reduce(reduceAddAvg(attr), reduceRemoveAvg(attr), reduceInitAvg)`
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