Overloading Equality Operator for Arrays
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I have a class with the eq() operator overloaded, but I'm not sure the best way to make it work with object arrays, in a similar way to the way standard arrays work for equality. Here's the code that I have right now. For reference, the class is designed to work with spheres in 3D space, with a center [x, y, z] and a radius.
function test=eq(a,b)
if all(size(a.xyz)==size(b.xyz))
if (a.radius==b.radius)
test=all(a.xyz==b.xyz);
else
test=false;
end
else
test=false;
end
end
采纳的回答
Perhaps as follows
function test=eq(a,b)
test = all([a.xyz]==[b.xyz]) & all([a.radius]==[b.radius]);
end
3 个评论
Daniel Shub
2013-6-13
编辑：Daniel Shub
2013-6-13
The ISEQUAL function might be better since it handles unequal size and unequal class vectors.
Daniel
2013-6-13
if both elements are the same I get [1, 1] as expected
That expectation was not evident. For all we can tell, you are looking for behavior similar to ISEQUAL, which always returns a scalar true/false output, regardless of the inputs' sizes. You also shouldn't be getting a non-scalar output from my code.
But if you do want non-scalar true/false output, you would instead do this
function test=eq(a,b)
if ~isequal(size(a), size(b))
error 'Dimension Mismatch'
end
xyz_eq=all(vertcat(a.xyz) == vertcat(b.xyz),2);
%assumes xyz are row vectors
radius_eq=vertcat(a.radius)==vertcat(b.radius);
test = reshape(xyz_eq & radius_eq, size(a));
end
if the object is empty, xyz is just [] and this will through a "matrix dimensions must agree" error, which is why I had the size comparison to start with.
The "dimensions must agree" error is consistent with the normal behavior of EQ for numerical arrays, e.g.,
>> [1,2,3]==[]
Error using ==
Matrix dimensions must agree.
It's not clear why you would want to be getting rid of it now.
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