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

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Davide 2016 年 3 月 1 日
コメント済み: Davide 2016 年 3 月 2 日
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.


Robert Snoeberger
Robert Snoeberger 2016 年 3 月 2 日
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
  1 件のコメント
Davide 2016 年 3 月 2 日
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.


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