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                ``` ;|函數名稱:????????XD::Vec:Dot 調用格式:????????(XD::Vec:Dot??v1?v2) 參數說明:????????v1?------?向量 v2?------?向量 返回值:????????實數 函數簡介:????????向量點積函數 來源:????????原創 函數作者:????????marting 適用版本:????????不限? 最后更新時間:????????2017-06-05 備注:????????向量--?用點表示向量點積的幾何意義:等于兩向量夾角的余弦|;(defun?XD::Vec:Dot?(v1?v2)??(apply?'+?(mapcar?'*?v1?v2))) ```
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