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                ``` ;|函數名稱:XD::Vec:Length 調用格式:(XD::Vec:Length?v) 參數說明:???????? v?------?向量 返回值:?實數函數 簡介:?向量長度 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|; (defun?XD::Vec:Length?(?v?)(sqrt(apply?'+(mapcar?'\*?v?v)))) ```
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