true if normalization completed normally, false if
all elements in range were zero or if range is empty.
normalize
fn
bool normalize(R)(R range, ElementType!(R) sum = 1) if (isForwardRange!(R))Normalizes values in range by multiplying each element with a number chosen such that values sum up to sum. If elements in range sum to zero, assigns sum / range.length to all. Normalization makes sense only if all elements in range are positive. normalize assumes that is the case without checking it.