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To combine horizontally two DataFrames df1 and df2 with matching index: import pandas as pd df1 = pd.DataFrame <https://www.skytowner.com/explore/pandas_dataframe_constructor>({'A':[1,2,3], 'B':[4,5,6]}) df2 = pd.DataFrame <https://www.skytowner.com/explore/pandas_dataframe_constructor>({'C':[7,8,9], 'D':[10,11,12]}) df_concat = pd.concat <https://www.skytowner.com/explore/pandas_concat_method>([df1, df2], axis=1) df_concat A B C D 0 1 4 7 10 1 2 5 8 11 2 3 6 9 12 Concatenate two matrices horizontally. Create two matrices, and horizontally append the second matrix to the first by using square bracket notation. A = [1 2; 3 4] A = *2×2* 1 2 3 4 B = [4 5 6; 7 8 9] B = *2×3* 4 5 6 7 8 9 C = [A,B] C = *2×5* 1 2 4 5 6 3 4 7 8 9 Reference: [1] https://www.skytowner.com/explore/concatenating_dataframes_horizontally_in_pandas [2] https://www.mathworks.com/help//matlab/ref/double.horzcat.html [3] https://people.revoledu.com/kardi/tutorial/LinearAlgebra/HorzConcatenation.html Xiangwei Wei <wxw19981...@gmail.com> 于2023年2月6日周一 15:06写道： > I investigated two typical situation like DataFrame in Pandas and Matrix > in Matlab. > They both expresses this as horizontally concatenation. > > [image: image.png] > > [image: image.png] > > [image: image.png] > > Jialin Qiao <qiaojia...@apache.org> 于2023年2月6日周一 15:03写道： > >> +1 for Plan A: Rename it as HorizontallyConcatOperator. >> ————————————————— >> Jialin Qiao >> Apache IoTDB PMC >> >> Xiangwei Wei <wxw19981...@gmail.com> 于2023年2月6日周一 14:35写道： >> > >> > VerticallyConcatOperator is used to horizontally concatenate TsBlocks >> with >> > the same timestamp column. For example, >> > TsBlock A is: >> > | Time | ColumnA | >> > | 1 | 1.0 | >> > TsBlock B is: >> > | Time | ColumnB | >> > | 1 | 2.0 | >> > After the VerticallyConcatOperator, the result will be: >> > | Time | ColumnA | ColumnB | >> > | 1 | 1.0 | 2.0 | >> > >> > Literally, I think it's a horizontal concatenation. So I suggest rename >> it >> > as HorizontallyConcatOperator. >> > >> > However, I asked the author about the reason for this name. He said, >> "From >> > the view of a table, adding columns means vertical changes." >> > >> > What's your opinion? >> > >> > +1 for Plan A: Rename it as HorizontallyConcatOperator. >> > +1 for Plan B: Keep current name VerticallyConcatOperator. >> > >> > -- >> > Best, >> > Xiangwei Wei >> > > > -- > Best, > Xiangwei Wei > -- Best, Xiangwei Wei
