Python language in Matlab "No appropriate method, property, or field"

In the Python Shell the following command (used to pilot the Digsilent Powerfactory software) works fine: app.GetFromStudyCase("ComLdf"). However, I am not able to identify a suitable translation for this command within the Matlab environment. For example, using the syntax app.GetFromStudyCase('ComLdf'), Matlab gives the following error: "No appropriate method, property, or field 'GetFromStudyCase' for class 'py.powerfactory.Application'."

Any suggestion?

Thank you in advance for your support.

Answer 1

[Robert Snoeberger]

What type of attribute is 'GetFromStudyCase'? Is it an instance method, static method, etc? One way to check is to look at the display. What does the following command display?

>> py.getattr(app, 'GetFromStudyCase')

Here are a few workarounds to try:

1. Use eval to call the method.

py.eval('app.GetFromStudyCase("ComLdf")', struct('app', app))

2. Use feval to invoke the instance method object.

methodObj = py.getattr(app, 'GetFromStudyCase');
feval(methodObj, 'ComLdf') % starting in R2015a, the syntax methodObj('ComLdf') should work

3. Use py.operator.methodcaller to call the method.

f = py.operator.methodcaller('GetFromStudyCase', 'ComLdf');
feval(f, app) % starting in R2015a, the syntax f(app) should work

[Davide]

Actually, all the three methods work fine.

The getattr command displays:

Python Method with no properties.

    "<powerfactory.Method 'GetFromStudyCase' of PowerFactory>"

Are the three methods you suggested equivalent to call this method?

Thank you.