短語詞組短語directional partial derivative 方向偏導數(shù)directional second derivative 方向性二階微分directional E derivative 方向?qū)?shù)Directional derivative and gradient 方向?qū)?shù)與梯度maximum directional derivative 極大方向微商;極大方向?qū)?shù)hadamard directional derivative hadamard 方向?qū)?shù)first directional derivative 一階方向?qū)?shù)Extended -directional derivative 延拓方向?qū)?shù)clarke general directional derivative clarke 廣義方向?qū)?shù) 返回 directional derivative