How do i convert a Python Pandas Dataframe to Matlab types?

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Ricardo Alves
Ricardo Alves el 17 de Mayo de 2016
Respondida: Francesco Giaretta el 1 de Feb. de 2024
I am calling a python function from Matlab code which returns a Pandas Dataframe. I would like to convert the content of the DataFrame to Matlab data types, but I can't find the correct way to do it. Thanks in advance for any help on this.

Respuestas (6)

Todd Leonhardt
Todd Leonhardt el 18 de Mayo de 2016
A simple and effective, but perhaps inelegant, solution is to first save the Pandas DataFrame as a CSV file and then read that data into MATLAB as a table datatype (as long as you have MATLAB R2013b or newer).
You can save a Pandas DataFrame as a CSV file with the DataFrame.to_csv() function: http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.DataFrame.to_csv.html
You can read a CSV file into MATLAB as a table using the readtable() function: http://www.mathworks.com/help/matlab/ref/readtable.html

Todd Leonhardt
Todd Leonhardt el 18 de Mayo de 2016
Editada: Todd Leonhardt el 18 de Mayo de 2016
Another possibility is to convert the Pandas DataFrame to a Python dictionary using the DataFrame.to_dict() method: http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.to_dict.html
Once you have the data as a Python Dictionary, you should be able to a use that in MATLAB as shown here: http://www.mathworks.com/help/matlab/matlab_external/use-python-dict-type-in-matlab.html

Jeffrey Daniels
Jeffrey Daniels el 19 de Oct. de 2018
Editada: Jeffrey Daniels el 1 de Nov. de 2019
I solved this problem by querying the Pandas dataframe column data types and inserting them as the last row of the dataframe, convert the df to string and pass to Matlab. Then once in Matlab I have a method that reads the string into a Matlab table and applies the data type specified in the last row of the CSV to each column of the table. It's not elegant, but it is fairly bulletproof. This method works completely in memory space and does not require writing to hard drive.
  1 comentario
Dev-iL
Dev-iL el 6 de Mayo de 2020
Would it be possible for you to post a code sample? There are several moving parts in this solution...

Iniciar sesión para comentar.


Artem Lensky
Artem Lensky el 25 de Mayo de 2022
It implements two funcions:
  • df2t - that converts Pandas DataFrame to Matlab Table
  • t2df - that converts Matlab Table to Pandas DataFrame.
The examples are shown in test.mlx.

Bryan Yu
Bryan Yu el 1 de Dic. de 2017
HDF5 is native for both pandas and MATLAB. Could be a good compromise for speed and type safety.

Francesco Giaretta
Francesco Giaretta el 1 de Feb. de 2024

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