熊猫基于索引和列合并两个数据框

Question

I have following two dataframes:

The measurements:

And the corresponding sample descriptions:

I managed to get the second dataframe into the following format:

I would like to add the first dataframe to the second and name it something like 'values'. How can I do that? I tried merge with different options but without success.

Answer 1

I solved it:

instead of bringing df_1 in the same form as df, I tried the opposite way:

and viola, merge is working like a charm:

df.index.name = 'row'
df_melt=pd.melt(df.reset_index(),id_vars='row',var_name='column')
pd.merge(df1,df_melt,on=['row','column'])