isa not recognizing Line or Figure class

Question

Mikael Agopov 2018-8-10

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/414372-isa-not-recognizing-line-or-figure-class

评论： KSSV 2018-8-10

采纳的回答： Guillaume

在 MATLAB Online 中打开

I wanted to test whether input data of a function is a Line object using something like:

>>

x=-2*pi:.01:2*pi;HLine=plot(sin(2*x));

However, now isa(HLine,'Line') returns false! So far, isa has faithfully recognized my self-made classes. Why doesn't it recognize Line?

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Answer 1

Guillaume 2018-8-10

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https://ww2.mathworks.cn/matlabcentral/answers/414372-isa-not-recognizing-line-or-figure-class#answer_332311

在 MATLAB Online 中打开

>> x=-2*pi:.01:2*pi;HLine=plot(sin(2*x));
>> class(HLine)
ans =
    'matlab.graphics.chart.primitive.Line'
>> isa(HLine, 'matlab.graphics.chart.primitive.Line')
ans =
  logical
   1

You need to use the fully qualified name of the class

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Mikael Agopov 2018-8-10

Thank you, that explains it.

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Answer 2

KSSV 2018-8-10

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x=-2*pi:.01:2*pi;
HLine=plot(sin(2*x));
strcmp(HLine.Type,'line')

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Guillaume 2018-8-10

Note that the Type property of a graphics object is not relevant for isa.

KSSV 2018-8-10

Yes....thats why I used strcmp to check is it a Line type.

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