More elegant initial value for xcmp
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@ -871,10 +871,7 @@ impl<N: Scalar, R: Dim, C: Dim, S: Storage<N, R, C>> Matrix<N, R, C, S> {
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fn xcmp<N2>(&self, abs: impl Fn(N) -> N2, ordering: Ordering) -> N2
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where N2: Scalar + PartialOrd + Zero {
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let mut iter = self.iter();
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let mut max = match iter.next() {
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Some(first) => abs(*first),
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None => { return N2::zero(); }
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};
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let mut max = iter.next().cloned().map_or(N2::zero(), &abs);
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for e in iter {
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let ae = abs(*e);
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