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Numpy——2.数组的形状
2022-07-07 17:03:00 【头发没了还会再长】
数组的形状
查看数组的形状
a.shape()
可以通过返回值数的个数来判断数组是几维的
修改数组的形状
a.reshape(x, y)
有返回值但不修改a数组a.flatten()
将数组直接变成一维
>
数组的计算
数组和数的计算
广播机制
数组和一个数进行计算的时候,将这个数作用到数组的每一个元素上面,其实这个数被展开成为和数组的维数,行数,列数一样的数组了,然后对应元素做运算
数组和数组的计算
相同shape的数组的计算,直接让对应元素做加减乘除即可
不同shape的数组的计算,如果是二维的,行和列必须有一维是相同的,另一维是1。如果是3维的减去一个二维的,也是看行和列
也是广播机制,会把行或者列小的那一维扩展为大的那一个
example 二维
example 三维
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