... pseudorandom vectors 伪随机向量 radial vector 径向向量、径向矢量 radio vector 无线电制导波束、无线电矢量 ...
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Radial basis vector 径向基向量
It's good to have a vector pointing in the radial direction of length one.
所以引入这么一个模长为 1,方向沿圆心向外辐射的矢量作用很大
At each point, er is a different vector pointing in the radial direction of length one.
矢量 er 在每一点处都不同,方向都从圆心指向该点,模长为1
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