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why does Matlab return ' expression to the left of the equals sign is not a valid target'

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Charles
Charles 2017 年 9 月 5 日
回答済み: Robert Snoeberger 2017 年 9 月 6 日
I am using MATLAB 2017a and Python 3.6 I am trying to call a Python script from within the MATLAB window and assign the returned variables to the MATLAB workspace.
I am told by MATLAB help desk that MATLAB does support this version of Python, contrary to what their website says. I have copied my Python folder to my MATLAB pathway as follows:
insert(py.sys.path,int32(0), '/Users/....../Oandafx');
I now attempt to execute the following command in the MATLAB command window
N = py.oandafx.get_history('EUR_USD', granularity='D', prices='BA', count=5)
I get the following error. Can you tell me where I am going wrong?
Error: The expression to the left of the equals sign is not a valid target for an assignment.

回答 (2 件)

Robert Snoeberger
Robert Snoeberger 2017 年 9 月 6 日
MATLAB doesn't support keyword arguments [1]. To pass keyword argument to Python, use pyargs [2].
Example:
N = py.oandafx.get_history('EUR_USD', pyargs('granularity','D','prices','BA','count',5))
  1. https://docs.python.org/2/tutorial/controlflow.html#keyword-arguments
  2. https://www.mathworks.com/help/matlab/ref/pyargs.html

Walter Roberson
Walter Roberson 2017 年 9 月 5 日
It is not legal to have '=' inside MATLAB expressions. You probably need to do a bunch of quoting.
  2 件のコメント
Charles
Charles 2017 年 9 月 5 日
What do you mean. "A bunch of quoting"?
James Tursa
James Tursa 2017 年 9 月 5 日
E.g., you can't have this as a literal argument:
count=5
You might have to quote the whole thing like this
'count=5'
Same for the other arguments with equal signs. It will depend on what form py.oandafx.get_history accepts.

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