Sudden error "Conversion to double from struct is not possible"

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The error message occurred suddenly after many successful runs of a script and without altering the line nor any near it. tried in command window and the result was the same. The line appears to be a precise replica of the example line in Matlab help.
>> set(gcf,'WindowState','maximized')
Error using set
Conversion to double from struct is not possible.
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Accepted Answer

Walter Roberson
Walter Roberson on 5 Dec 2020
You might have assigned a value to a variable named gcf
Or possibly you introduced a new function named gcf
which gcf
  10 Comments
Walter Roberson
Walter Roberson on 6 Dec 2020
Ah yes, that could do it.
Unfortunately gcf and gca are functions . Although with a relatively recent change to MATLAB it is possible to hack to be able to access properties of the object returned, you cannot assign to it:
>> struct('T', gcf).T.WindowState
ans =
'normal'
I do not recommend this hack.

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