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法向量一般直接看系数,面的标准方程是ax+by+cz+d=0.法向量就是是(a,b,c); 两个向量的外积是这两个向量组成的平面的法向量。 a x b 直线的方向向量, 切线斜率与法线斜率相乘等于 即已知直线l:ax+by+c=0,则直线l的方向向量为(-b,a)或(b,-a); 参考: [1] h 阅读全文
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If you want the files to be extracted to a particular destination you can add -C /destination/path/ Make sure you make the directory first, in this ca 阅读全文
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fstring >>> name = "Eric" >>> age = 74 >>> f"Hello, {name}. You are {age}." 'Hello, Eric. You are 74.' >>> F"Hello, {name}. You are {age}." 'Hello, Er 阅读全文
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!conda install --yes numpy !pip install numpy !echo $PATH # If you want to know what is actually executed # when you type python, you can use the type 阅读全文