What does -1.#IND mean (double stream output)

Question

I could neither find it via google, search here or on Microsofts helppages...

After some extensive calculations, sometimes, when outputting my doubles via std::cout i prints as result on console:

-1.#IND

There are no modifcations(like precision etc) to the cout-stream. I assume the program wants to tell me about some sort of error, but I can't figure it out :/ It doesn't happen that often but with a low frequency (it is a genetical algorithm, so i have an output after every generation, and in about every 5th to 10th generation this seems to happen...)

For information, I'm using Visual Studio Pro 2013.

This stands for INDeterminate also known as NaN (Not A Number) and is the result of an illegal operation like a division by zero. — Nicolas, May 07 '14 at 18:23

David S. · Answer 1 · 2014-05-07T19:40:49.367

0

Windows displays NaN as -1.#IND. NaN is a result of a mathematical operation that does not make sense. For example, 0.0 / 0.0, or sqrt(-1.0) will return NaN. I can't really help further without more details about the underlying operation. Hopefully this is enough to point you in the right direction, though.

edited May 07 '14 at 19:40

answered May 07 '14 at 18:16

David S.

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What does -1.#IND mean (double stream output)

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