在給定溫度范圍內查找數組中的最大值

Question

Study   Gas Surfactant  Surfactant Concentration    Additive    Additive 

Concentration   LiquidPhase Quality Pressure (Psi)  Temperature (C)     Shear Rate (/Sec)   Halflife (Min)  Viscosity   Color
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  50  0   0   0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  50  0   51  0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  50  0   61  0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  50  0   75  0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  50  0   105 0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  50  0   0   0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  50  0   12  0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  50  0   25  0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  50  0   34  0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  50  0   48  0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  100 0   0   0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  100 0   0.1 0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  100 0   0.5 0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  100 0   0.79    0   yellow
Thakore 2020    N2  AOS 1 w%    None    None    DI Water    0.95    10  100 0   0.9 0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  50  0   0   0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  50  0   26  0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  50  0   72  0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  50  0   84  0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  50  0   120 0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   0   0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   0.33    0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   1   0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   1.9 0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   2.4 0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   0   0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   0.2 0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   1   0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   1.3 0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   1.9 0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   0   0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   0.1 0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   0.2 0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   0.26    0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  100 0   0.3 0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  150 0   0   0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  150 0   0.05    0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  150 0   0.08    0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  150 0   0.13    0   yellow
Thakore 2020    N2  AOS 1 w%    Guar    0.36 w% DI Water    0.95    10  150 0   0.2 0   yellow

上面顯示的是我的數組示例。 我如何找到給定溫度下“半衰期”的最大值？ 假設我想從溫度為 25 度的每個元素中找到“半衰期”的最大值。 有沒有一種優雅的方法來做到這一點？

我嘗試在for循環中循環，將溫度拆分為單獨的列表，然后使用大量if語句，找到每個列表的最大值並將其編譯回主列表。 這非常丑陋且耗時，我想知道是否有更好的方法來做到這一點。 請告訴我！

基本上我在這里將 excel 文件加載到 Pandas 數據框中：

dv = pd.read_excel('data.xlsx')

然后我清理它並將其重命名為“已清理”，這並不重要，只是提一下。

ahmed17 = cleaned[cleaned.Study == "Ahmed 2017"]
ahmed18 = cleaned[cleaned.Study == "Ahmed 2018"]
alzo = cleaned[cleaned.Study == "Alzobaidi 2017"]
reid = cleaned[cleaned.Study == "Reidenbach 1986"]
har = cleaned[cleaned.Study == "Harris 1987"]
chen = cleaned[cleaned.Study == "Chen, Y. 2016b"]
yan = cleaned[cleaned.Study == "Yanqing Wang 2017"]
hut = cleaned[cleaned.Study == "Hutchins 2005"]
tha = cleaned[cleaned.Study == "Thakore 2020"]
ha = cleaned[cleaned.Study == "Harris 1995"]

從那里，我將清理過的數據框分成單獨的研究，這個項目是一個文獻組合。

trace1 = go.Scatter(y=ahmed17[selected_y], x=ahmed17[selected_x])

最后，我將每個單獨的研究加載到跟蹤中，並將它們顯示在圖表中。 Selected y 和 selected x 是字符串，例如“Temperature (C)”和“Halflife (Min)”。

我需要做的是，在將數組拆分為單獨的研究之前，找到相對於每個溫度（0,50,100,150,200,250,300）的最大“半衰期”並將它們編譯成單獨的列表，然后將它們編譯成同一個列表。 從那里我可以將列表分成單獨的研究，我很高興。 我曾嘗試使用以下內容來做到這一點：

tha25 = [x for x in tha[selected_x] if x == 25]

要將 thakore 研究分成 25 度列表，然后從那里找到最大值。 但是我為我編譯的列表得到了一堆 Nan 值，我不確定我是否正確地拆分了列表。

Answer 1

如果您原始的、清理過的數據框是 df ，那么試試這個：

(df[df['Temperature']==25])['Halflife'].max()