Note

Go to the end to download the full example code.

12.3.10.3.1. Matlab engine#

This demo shows how to communicate with the Matlab engine.

try:
    import matlab
except Exception as ex:
    print("itom is possibly compiled without Matlab support. This demo is not working")
    raise ex

from itom import dataObject

A Matlab console is opened Matlab can only be properly loaded if the libraries libeng.dll and libmx.dll (or libeng.so and libmx.so under linux) can be properly found in the PATH of the operating system. An itom x64 also requires a Matlab x64 version and vice-versa. Re-login to your computer after having changed the PATH variable, if Qt is also contained in the PATH variable, put the Matlab path after Qt since the bin folder of Matlab also contains old Qt libraries. If the matlab libraries could be loaded but the session could not be started, also see this link (for Windows users): http://de.mathworks.com/help/matlab/matlab_external/register-matlab-as-automation-server.html.

session = matlab.MatlabSession()

Creates the string variable ‘myString’ in the Matlab workspace having the value ‘test’.

session.setString("myString", "test")
print("myString:", session.getString("myString"))  # returns 'test' as answer in tiom

Creates a 2x3 random matrix in Matlab (name: myArray).

session.setValue("myArray", dataObject.randN([2, 3], "int16"))
arr = session.getValue(
    "myArray"
)  # returns the 2x3 array 'myArray' from Matlab as Numpy array
print(arr)

Read the current working directory of matlab.

session.run("curDir = cd")
print(session.getString("curDir"))

Run directly executes the command (as string). This is the same than typing this command into the command line of Matlab. use this to also execute functions in Matlab. At first, send all required variables to the Matlab workspace, then execute a function that uses these variables.

del session  # closes the session and deletes the instance

# session.close() only closes the session
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