© 2020 The MathWorks, Inc.

Using MATLAB with Python

Twitter: @HeatherGorr

Instagram: @heather.codes

Heather Gorr, PhD

Senior Product Manager, MATLAB

MathWorks

Amazing applications are built using MATLAB!

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.NET

Java

C/ C++

Python HTTP

https://www.mathworks.com/help/matlab/external-language-interfaces.html

MATLAB provides flexible integration with multiple languages

Using MATLAB with Python

▪ Example overview

▪ Calling Python libraries from MATLAB

▪ Calling MATLAB from Python

– via MATLAB Engine API

– via MATLAB Runtime (MATLAB Compiler SDK)

– via MATLAB Production Server

▪ Additional info

– Data management

– Deep learning

– Troubleshooting

▪ Resources

Sentiment Analysis Example

Example files:

https://github.com/mathworks/matlab-with-python

“That movie

was terrible!”

Sentiment Analysis Example

Sentiment Analysis Example

MATLABPython

Sentiment Analysis Example: Calling Python from MATLAB

MATLAB

Python

Sentiment Analysis Example: Calling MATLAB from Python

MATLAB

Python

Using MATLAB with Python

▪ Calling libraries written in Python from MATLAB– MATLAB

▪ Calling MATLAB from Python– MATLAB

▪ Packaging MATLAB programs for

scalable deployment with Python

– MATLAB Compiler SDK

– MATLAB Production Server

MATLAB Type Example Python Type Example

Scalar double 9.0 Float 9.0

Char 'A' Str 'A'

Cell array {'apple',2,1} List ['apple',2,1]

1-by-n double [1.0, 2.0, 3.0] array.array(‘d’) [1.0, 2.0, 3.0]

m-by-n matrix [ 1.0, 2.0

3.0, 4.0 ]

MATLAB Type Example Python Type Example

Scalar double 9.0 Float 9.0

Char 'A' Str 'A'

Cell array {'apple',2,1} List ['apple',2,1]

1-by-n double [1.0, 2.0, 3.0] array.array(‘d’) [1.0, 2.0, 3.0]

m-by-n matrix [ 1.0, 2.0

3.0, 4.0 ]memoryview object

MATLAB Type Example Python Type Example

Scalar double 9.0 Float 9.0

Char 'A' Str 'A'

Cell array {'apple',2,1} List ['apple',2,1]

1-by-n double [1.0, 2.0, 3.0] array.array(‘d’) [1.0, 2.0, 3.0]

MATLAB Type Example Python Type Example

Scalar double 9.0 Float 9.0

MATLAB Type Example Python Type Example

Scalar double 9.0 Float 9.0

Char 'A' Str 'A'

MATLAB Type Example Python Type Example

Scalar double 9.0 Float 9.0

Char 'A' Str 'A'

Cell array {'apple',2,1} Tuple ['apple',2,1]

MATLAB Converts Core Python Types

>> x = 9.0;

>> a = py.math.sqrt(x);

>> class(a)

'double'

https://www.mathworks.com/help/matlab/python-data-types.html

>> py.print('hello','world',...

pyargs('sep',', '))

>> py.math.sqrt(42)

MATLAB

>>> import math

>>> math.sqrt(42)

Python

>>> print('hello','world',sep=', ')

Note the syntax differences when calling Python from MATLAB

>> [s,sidx] = sort(x)

MATLAB

>>> s = eng.sort(x,nargout=2)

Python

Note the syntax differences when calling MATLAB from Python

>> C = A + B >>> C = eng.plus(A,B)

>> foo(x) >>> eng.foo(x,nargout=0)

MATLAB Production Server manages multiple MATLAB Runtime

versions simultaneously

▪ RESTful API:

– https://www.mathworks.com/help/mps/restful-api-and-json.html

▪ Python Client:

– https://www.mathworks.com/help/mps/python/create-a-matlab-production-server-python-

client.html

Using MATLAB with Python for Deep Learning

▪ Import and export networks directly using ONNX and Tensorflow-Keras

importers:

▪ https://www.mathworks.com/solutions/deep-learning/models.html

Use Apache Parquet to store and transfer tabular data between

MATLAB and Python

▪ Working with Parquet files:

▪ https://www.mathworks.com/help/matlab/parquet-files.html

▪ MATLAB library for Apache Arrow on GitHub:

▪ https://github.com/apache/arrow/tree/master/matlab

Troubleshooting

▪ Sophisticated exception handling

options exist

▪ See the documentation

▪ Call tech support!

▪ MATLAB Answers, community

https://www.mathworks.com/help/matlab/getting-started-with-python.html

https://www.mathworks.com/help/matlab/matlab-engine-for-python.html

Resources

▪ General:

▪ https://www.mathworks.com/products/matlab/matlab-and-python.html

▪ Python from MATLAB:

▪ https://www.mathworks.com/help/matlab/call-python-libraries.html

▪ MATLAB from Python:

– MATLAB Engine API:

– https://www.mathworks.com/help/matlab/matlab-engine-for-python.html

– MATLAB Compiler SDK:

– https://www.mathworks.com/help/compiler_sdk/python_packages.html

– Data type conversions:

– https://www.mathworks.com/help/matlab/python-data-types.html

▪ Example:

▪ https://github.com/mathworks/matlab-with-python

Using MATLAB with Python

Python

MATLAB

+

@HeatherGorr

@heather.codes

Heather Gorr, PhD