以绝对值对熊猫系列进行排序[重复]答案

【问题标题】：Sorting a pandas series in absolute value [duplicate]以绝对值对熊猫系列进行排序[重复]
【发布时间】：2015-12-08 16:18:32
【问题描述】：

我有一个如下的熊猫系列：

admission_age_inyears                                           [3.86703690989]
emergencydepartmentlengthofstayminutes                          [3.84708584711]
current_los_from_admissions                                     [3.83956976064]
total_time_in_progressive_inpatient                             [3.63955027973]
total_time_spent_inpatient                                      [2.59339330312]
nbr_of_hosp_last_90_days                                        [2.44570139977]
total_time_spent_in_er                                          [2.37914969651]
prior_admittype_emergency                                       [2.18467109815]
nbr_inpatient_visits                                            [2.09615621507]
curr_rx_gen_atorvastatin_calcium                                [2.08752966479]
substanceusehistory       
curr_rx_gen_tranexamic_acid                                    [-1.87352757522]
total_current_thera_ana                                        [-1.89007660143]
total_surgery_duration                                         [-2.50947580961]
avg_surgery_duration                                           [-2.58916844719]
curr_rx_gen_celecoxib                                           [-2.6594131822]
curr_rx_gen_propofol_iv                                        [-3.04498593439]
curr_rx_gen_fentanyl_citrate                                   [-3.14017330213]
curr_rx_gen_ketorolac_tromethamine                             [-3.14424766125]
curr_rx_gen_acetaminophen                                      [-3.47925239986]
tot_est_median_income_dollars                                  [-3.59465137553]
curr_rx_gen_midazolam_hcl                                      [-3.73260903286]

我想按降序对这个系列进行排序，这样绝对值最高的特征应该排在最前面。因此，这里所有权重为 3+ 的特征（无论是负数还是正数）都将排在最前面，然后是所有 2，依此类推。还希望相应的实际值与名称一起出现

请指教

【问题讨论】：

您能否发布原始输入数据和代码来重现您的 df，不清楚您的值是浮点数还是具有单个浮点元素或字符串的列表
这是一个以系列索引为特征名称，以系列列为值列表的系列。它是一个列表，每个索引特征对应一个浮点元素
见这里 - stackoverflow.com/questions/30486263/…
另一种方式df.iloc[df.col_name.abs().argsort()] :)

标签： python numpy pandas

【解决方案1】：

要对值进行排序，您可以执行以下操作

In [95]:
order = S.map(lambda x : x[0]).abs().sort_values(ascending = False)
order
Out[95]:
admission_age_inyears                     3.867037
emergencydepartmentlengthofstayminutes    3.847086
current_los_from_admissions               3.839570
curr_rx_gen_midazolam_hcl                 3.732609
total_time_in_progressive_inpatient       3.639550
tot_est_median_income_dollars             3.594651
curr_rx_gen_acetaminophen                 3.479252
curr_rx_gen_ketorolac_tromethamine        3.144248
curr_rx_gen_fentanyl_citrate              3.140173
curr_rx_gen_propofol_iv                   3.044986
curr_rx_gen_celecoxib                     2.659413
total_time_spent_inpatient                2.593393
avg_surgery_duration                      2.589168
total_surgery_duration                    2.509476
nbr_of_hosp_last_90_days                  2.445701
total_time_spent_in_er                    2.379150
prior_admittype_emergency                 2.184671
nbr_inpatient_visits                      2.096156
curr_rx_gen_atorvastatin_calcium          2.087530
total_current_thera_ana                   1.890077
curr_rx_gen_tranexamic_acid               1.873528
substanceusehistory                            NaN
dtype: float64

如果您想对值进行排序并保留与原始系列中相同的数据，您可以执行以下操作

In [96]:
order.index
S[order.index]
Out[96]:
admission_age_inyears                      [3.86703690989]
emergencydepartmentlengthofstayminutes     [3.84708584711]
current_los_from_admissions                [3.83956976064]
curr_rx_gen_midazolam_hcl                 [-3.73260903286]
total_time_in_progressive_inpatient        [3.63955027973]
tot_est_median_income_dollars             [-3.59465137553]
curr_rx_gen_acetaminophen                 [-3.47925239986]
curr_rx_gen_ketorolac_tromethamine        [-3.14424766125]
curr_rx_gen_fentanyl_citrate              [-3.14017330213]
curr_rx_gen_propofol_iv                   [-3.04498593439]
curr_rx_gen_celecoxib                      [-2.6594131822]
total_time_spent_inpatient                 [2.59339330312]
avg_surgery_duration                      [-2.58916844719]
total_surgery_duration                    [-2.50947580961]
nbr_of_hosp_last_90_days                   [2.44570139977]
total_time_spent_in_er                     [2.37914969651]
prior_admittype_emergency                  [2.18467109815]
nbr_inpatient_visits                       [2.09615621507]
curr_rx_gen_atorvastatin_calcium           [2.08752966479]
total_current_thera_ana                   [-1.89007660143]
curr_rx_gen_tranexamic_acid               [-1.87352757522]
substanceusehistory                                  [nan]
dtype: object

【讨论】：