可视化季节性规律

比较一个中西部地点和一个西南部地点的季节性降水.

WeatherData 提供了以厘米为单位的综合降水量.

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start = {1999, 1, 1}; end = {2015, 12, 31};

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getData[place_] := WeatherData[place, "TotalPrecipitation", {start, end, "Month"}]

创建伊利诺伊州香槟市和亚利桑那州凤凰城的 TimeSeries. 指定 MissingDataMethod 用插值方法来填补遗漏的数据.

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makeTS[place_] := TimeSeries[getData[place], MissingDataMethod -> "Interpolation"]

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tsIL = makeTS[ Entity["City", {"Champaign", "Illinois", "UnitedStates"}]]

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tsAZ = makeTS[Entity["City", {"Phoenix", "Arizona", "UnitedStates"}]]

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以降水量为权重创建 WeightedData，并通过在总年数上对数据作平均来绘制 DateHistogram.

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dataIL = WeightedData[tsIL["Dates"], tsIL["Values"]]; dataAZ = WeightedData[tsAZ["Dates"], tsAZ["Values"]];

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totalyears = (end[[1]] - start[[1]] + 1);

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avg := Function[{x, y}, y/totalyears]

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makeHistogram[data_, lab_] := DateHistogram[data, "Month", avg, DateReduction -> "Year", PlotRange -> {All, {-1, 9}}, AxesLabel -> "cm", PlotLabel -> lab]

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{makeHistogram[dataIL, "IL"], makeHistogram[dataAZ, "AZ"]}

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