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请教为什么ssg这么计算夹角? #4

@loveheaven

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@loveheaven

请教为什么ssg这么计算夹角?我理解计算cone圆锥的夹角不是这么计算吧。

float djk = distance_->compare(data_ + dimension_ * (size_t)result[t].id,
data_ + dimension_ * (size_t)p.id,
(unsigned)dimension_);
float cos_ij = (p.distance + result[t].distance - djk) / 2 /
sqrt(p.distance * result[t].distance);
希望能得到指教。

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