Different languages define the modulo operator differently when negative
numbers are involved.
In emc2, MOD is defined to always have a positive result. It is defined
in terms of the ISO C "fmod" function as follows ("*left" has a double role as
the left-hand input and the result of the calculation):
*left = fmod(*left, *right);
if (*left < 0.0) {
*left = (*left + fabs(*right));
}
Jeff
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