How To Install Matlab Engine For Python

Running MATLAB in Python

MATLAB and Python are two of most popular languages, I think a lot of people have such requirement that quondam you want to load a very powerful role from MATLAB into your Python Script. In fact, you can use "bone.organization('matlab <role proper name(params)>')" from os library in Python to run your MATLAB function.

          import bone
bone.organization('matlab -nosplash -nodesktop -r "myFunc('par_name','par_val') "')        

But is information technology the best solution? The disadvantage of this is that you need to convert all your input for your MALTAB function into string variables. Which means you tin can not straight using python data structure (listing, dict,…) into MATLAB function. Imagine if your office input is a big scale list, that will be a disaster to convert listing into a string type.😂

          input_list = '1,ii,3,four,five,6,seven'
os.arrangement('matlab -nosplash -nodesktop -r "myFunc(%s)"' %input_list)        

So is there other solutions for this? YES — 'matlab.engine' API.

This blog i merely try to tell you lot how to brand a interface between MATLAB & Python by 'matlab.engine'.

i. Package Installation

Python Version: only support Python v2.7, v3.6, v3.7.

MATLAB Version: ≥2014b

Install Procedure

Pace 1. Find y'all matlab root directory, utilize ' matlabroot ' command in MATLAB

Step two. motion into <matlabroot>/extern/engines/python folder

          cd <matlabroot>/extern/engines/python        

Step 3: type ' python setup.py install ' in command prompt

          python setup.py install                  

For more than item of installation, you can click following link from MathWorks.

Install MATLAB Engine API for Python

Install MATLAB Engine API for Python in Nondefault Locations

ii. How to use matlab.engine package in Python

Assume we want to apply myFunc(param_dict, param_list) from MATLAB in Python

Southtart the matlab engine by calling start_matlab, this volition return a Python object which enables you lot to pass data and telephone call functions from MATLAB. Subsequently finishing calling MATLAB function, then stop matlab.engine.

          import matlab.engine
## define input argvs          param_dict = {'param1': 10,'param2': 12}
param_list = [1,two,3]
## call MATLAB functions          eng = matlab.engine.start_matlab()
eng.myFunc(param_dict,param_list,nargout=0)          ## stop matlab.engine
eng.quit()        

Note: nargout is corporeality of your output, if you lot didn't have any return value then set as 0.

three. Read and transform Python input into MATLAB data structure

Python does allow us to laissez passer python information construction into MATLAB past matlab.engine, but how to handle information from Python in MATLAB script.

ThouATLAB has provided plenty of functions to convert well-nigh Python data types into MATLAB types. (List, Dict, Tuple,…)

Python List/Tuple Type

To load Python list/tuple data, MATLAB usually converts information technology into prison cell array.

          %% suppose at that place is a python listing input Fifty= [1,ii,three,4]
%% also there is a python tuple input T = (1,2,iii)          convert_L = cell(L);
convert_T = cell(T);          %% read element in L/T past index
first_element_L = convert_L{1};
first_element_T = convert_T{1};        

Python Dict Blazon

MATLAB commonly converts dict data type into structure.

          %% suppose python return a simple dict into MATLAB D = {'par1': 1,'par2': 2}          %% load the whole dictionary into construction          convert_D_struct = struct(py.dict(D));
disp(convert_D_struct.par1);          %% separately load keys and value from dict
convert_D = py.dict(D);
convert_D_keys = prison cell(keys(convert_D));
convert_D_vals = jail cell(values(convert_D));          disp(convert_D_keys{1});
disp(convert_D_vals{i});        

Instead of Listing, Tuple, Dict, MATLAB also back up loading string, numeric types and array from Python. For more than particular, click here (Python Data Types in MATLAB)

Source: https://medium.com/@boshengwu1994/running-matlab-in-python-870f25bf40c7

Posted by: looneysamet1997.blogspot.com

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