Python-熊猫：找出对角线以外的最大值

Question

This is somewhat complicated. I have multiple dataframes df , all with the same columns and index that looks like the one below:

       E          F          H            
row                                                                     
CE     17.917153 10.875160   9.970251 
CF     9.780500  16.261098  10.021619    
CH     12.293967 10.608844  10.870527 

My objective in each df is to find the two maximum values in the dataframe and their corresponding index and column . These max values cannot be on the diagonal . How can I do so?

Answer 1

from pandas import *


L = [[17.917153, 10.875160,   9.970251],   
     [9.780500,  16.261098,  10.021619], 
     [12.293967, 10.608844,  10.870527]]

df = DataFrame(L)

df2 = df.unstack().copy()

df2.sort()

IDX = df2[:].index

IDX = list(reversed(IDX))


M = []

for x in IDX[1:]:
    if(x[0]==x[1]):
        continue
    M.append(x);
    if(len(M)==2):
        break;

Max1 = M[0]
Max2 = M[1]


print "Max1 : ", Max1, "->", df2[Max1] 
print "Max2 : ", Max2, "->", df2[Max2]

Output:

Max1 :  (0, 2) -> 12.293967
Max2 :  (1, 0) -> 10.87516
         ^
       column