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src/dqe_stddev_aggr.erl
-module(dqe_stddev_aggr).
-behaviour(dqe_fun).
-include_lib("mmath/include/mmath.hrl").
-export([spec/0, describe/1, init/1, chunk/1, resolution/2, run/2,
help/0]).
-record(state, {
time :: pos_integer(),
count :: pos_integer()
}).
init([Time]) when is_integer(Time) ->
#state{time = Time}.
chunk(#state{time = Time}) ->
Time * ?RDATA_SIZE.
resolution(Resolution, State = #state{time = Time}) ->
Res = dqe_time:apply_times(Time, Resolution),
{Res, State#state{count = Res}}.
describe(#state{time = Time}) ->
["stddev(", integer_to_list(Time), "ms)"].
spec() ->
{<<"stddev">>, [metric, time], none, metric}.
run([Data], S = #state{count = Count}) ->
{mmath_aggr:stddev(Data, Count), S}.
help() ->
<<"Calculates the standard derivation over a given period of time.">>.