How can I use Python pandas in MATLAB?

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Kouichi C. Nakamura
Kouichi C. Nakamura el 22 de Mayo de 2019
Respondida: Artem Lensky el 25 de Mayo de 2022
Looking at this tutorial (https://uk.mathworks.com/help/matlab/matlab_external/call-user-defined-custom-module.html), it appears easy to use a Python module in MATLAB.
I'd like to execute the following Python code snippet in MATLAB:
import pandas
tbl = pandas.read_csv('xxxxx.csv')
However, the following does not work in MATLAB.
tbl = py.pandas.read_csv('xxxxx.csv')
Any suggestions?

Respuesta aceptada

Kouichi C. Nakamura
Kouichi C. Nakamura el 22 de Mayo de 2019
Editada: Kouichi C. Nakamura el 23 de Mayo de 2019
pyversion returns Python installation outside of Anaconda.
>> pyversion
version: '2.7'
executable: 'C:\Python27\python.EXE'
library: 'C:\WINDOWS\system32\python27.dll'
home: 'C:\Python27'
isloaded: 1
So I needed to change the reference to the Anaconda version of Python.
After relaunching MATLAB, I used pyversion again to change the Python path. Then py.pandas.read_csv() worked!
>> pyversion 'C:\Users\xxxxxxxxx\AppData\Local\Continuum\anaconda2\python.EXE'
>> pyversion
version: '2.7'
executable: 'C:\Users\xxxxxxxxx\AppData\Local\Continuum\anaconda2\python.EXE'
library: 'C:\Users\xxxxxxxxx\AppData\Local\Continuum\anaconda2\python27.dll'
home: 'C:\Users\xxxxxxxxx\AppData\Local\Continuum\anaconda2'
isloaded: 1
>> py.pandas.read_csv('xxxxxxxxx.csv')
ans =
Python DataFrame with properties:
T: [1×1 py.pandas.core.frame.DataFrame]
at: [1×1 py.pandas.core.indexing._AtIndexer]
axes: [1×2 py.list]
blocks: [1×1 py.dict]
columns: [1×1 py.pandas.core.indexes.base.Index]
empty: 0
iat: [1×1 py.pandas.core.indexing._iAtIndexer]
iloc: [1×1 py.pandas.core.indexing._iLocIndexer]
index: [1×1 py.pandas.core.indexes.range.RangeIndex]
is_copy: [1×1 py.NoneType]
ix: [1×1 py.pandas.core.indexing._IXIndexer]
loc: [1×1 py.pandas.core.indexing._LocIndexer]
ndim: 2
shape: [1×2 py.tuple]
size: 120
style: [1×1 py.pandas.io.formats.style.Styler]
values: [1×1 py.numpy.ndarray]
...
0 ...
1 ...
2 ...
3 ...
4 ...
5 ...
6 ...
7 ...
8 ...
9 ...
10 ...
11 ...
12 ...
13 ...
14 ...
[15 rows x 8 columns]
  2 comentarios
Dominik Mattioli
Dominik Mattioli el 13 de Jun. de 2019
You didn't need to point python to your anaconda environment too? Particularly, where the environment in which pandas is installed?
Brett Swanson
Brett Swanson el 23 de Jun. de 2020
It probably worked because the default Anaconda environment ("base") has a huge number of modules (including pandas) installed.

Iniciar sesión para comentar.

Más respuestas (1)

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. Here is one example
Name = {["Roger", "Sanchez"];
["Paul", "Johnson"];
["Lisa", "Li"];
["Don", "Diaz"];
["Havana ", "Brown"]};
Age = [38;43;38;40;49];
Smoker = logical([1;0;1;0;1]);
Height = [71;69;64;67;64];
Weight = [176;163;131;133;119];
BloodPressure = [124 93; 109 77; 125 83; 117 75; 122 80];
T = table(Name,Age,Smoker,Height,Weight,BloodPressure);
T.BMI = (T.Weight * 0.453592)./(T.Height * 0.0254).^2;
df = t2df(T); % Convert Table to Python Pandas
% Sample from the dataframe
df_sampled = df.sample(int64(10), replace=true); % Call DataFrame functions
table_sampled = df2t(df_sampled) % Convert DataFrame back to Table

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