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

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Ricardo Alves
Ricardo Alves 2016-5-17
回答： Francesco Giaretta 2024-2-1
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.

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回答（6 个）

Todd Leonhardt
Todd Leonhardt 2016-5-18
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 2016-5-18
编辑：Todd Leonhardt 2016-5-18
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 2018-10-19
编辑：Jeffrey Daniels 2019-11-1
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.
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Dev-iL
Dev-iL 2020-5-6
Would it be possible for you to post a code sample? There are several moving parts in this solution...

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Artem Lensky
Artem Lensky 2022-5-25
Check this submission https://au.mathworks.com/matlabcentral/fileexchange/111770-pandastomatlab
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 2017-12-1
HDF5 is native for both pandas and MATLAB. Could be a good compromise for speed and type safety.
Francesco Giaretta

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