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From: Stephen Wandzura on 10 Aug 2010 03:55
Can anyone explain why this works:

MatrixMultiply =
Compile[
{{a, _Integer, 2}, {x, _Integer, 1}},
Inner[Times, a, x, Plus],
{{Inner[__], _Integer, 1}}
]

MatrixMultiply[{{2, 0}, {0, 1}}, {2, 1}]

But this doesn't:

LogicalMatrixMultiply =
Compile[
{{a, True | False, 2}, {x, True | False, 1}},
Inner[And, a, x, Or],
{{Inner[__], True | False, 1}}
]

LogicalMatrixMultiply[{{True, False}, {False, True}}, {True, False}]

I thought I used the correct syntax for Boolean arguments in Compile...

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