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Sym Matrices can be Indexed with non-Logical/non-Integer. Bug?

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Paul
Paul 2021년 9월 1일
댓글: Paul 2021년 9월 3일
Linear indexing into a sym array:
A = sym([1 2;3 4])
A = 
A(.5)
Warning: Integer operands are required for colon operator when used as index.
ans = 
1
A(1.1)
Warning: Integer operands are required for colon operator when used as index.
ans = 
1
A([1.2 2.2])
Warning: Integer operands are required for colon operator when used as index.
ans = 
But element indexing produces an error
A(1.2,2.2)
Index in position 2 is invalid. Array indices must be positive integers or logical values.

Error in sym/subsref (line 909)
R_tilde = builtin('subsref',L_tilde,Idx);
But note that the error message is about the index in position 2. For a real array the error is the index in the first position.
I assume that this is a bug?
  댓글 수: 2
Paul
Paul 2021년 9월 3일
Apparenty it is a "feature." I submitted to Tech Support and the response said a change in behavior has been submitted as an enhancement request. Seems like a bug to me.
I wonder if there are any other objects that have the same behavior as sym objects.

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