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[c++] -1.#IND

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So i have a double value who's value is -1.#IND after assignment. The assignment is a big mathematical formula involving trig, etc. What has happened to result in this? Cheers

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-1.#IND is the printed format for a quiet NaN (a non signalling non a number floating point value). Possible causes are passing a number outside the domain for a trig function or similar problems.

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