In the Visual Studio 2010 watch window, I found the value of a variable became -1.#IND000. What does this mean?
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IND is the representation of NaN (Not a Number) in Windows system. IND = "indeterminate form", mostly a result from an illegal operation like dividing by zero or arithmetic operation with infinity.

Peter Mortensen
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Chun-Fu Chao
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Thanks very much. It turns out the argument for acos() ran out of [-1, +1]; – shapeare Apr 04 '12 at 12:23