python – 访问结构化数组的NumPy数组的列
发布时间:2020-12-20 13:18:50 所属栏目:Python 来源:网络整理
导读:我得到了一个多维的numpy数组,x看起来像这样: array([ array([ 398.24475098,-196.1497345,-110.79341125,...,-1937.22399902,-6158.89355469,1742.84399414],dtype=float32),array([ 32.27750397,-171.73371887,-342.6328125,-4727.4296875,-2545.10375977
我得到了一个多维的numpy数组,x看起来像这样:
array([ array([ 398.24475098,-196.1497345,-110.79341125,...,-1937.22399902,-6158.89355469,1742.84399414],dtype=float32),array([ 32.27750397,-171.73371887,-342.6328125,-4727.4296875,-2545.10375977],array([ 785.83660889,-234.88890076,140.49914551,-7982.19482422,-2127.640625,-1434.77160645],array([ 181.93313599,-146.41413879,-416.02978516,-4517.796875,10491.84570312,-6604.39550781],array([ -1.37602341e+02,1.71733719e+02,7.13068867e+00,8.60104688e+03,1.39115127e+04,3.31622314e+03],array([ 453.17272949,152.49285889,260.41452026,19061.60742188,11232.8046875,7312.13964844],dtype=float32)],dtype=object) 我正在尝试访问每一列(特别是我试图获取每列的标准偏差).我找到了this answer,我试过了, >>> x[:,0] 但是这返回了一个错误: Traceback (most recent call last): File "<stdin>",line 1,in <module> IndexError: too many indices for array 是否可以将此结构化数组转换为简单的2D numpy数组来访问列?或者有直接访问这些列的好方法吗? 谢谢! 编辑 有关此阵列的更多信息: >>> x.shape (8685,) >>> x[0].shape # Same for x[1],x[2],... (3524,) 如果有任何帮助,我使用root_numpy包中的tree2array函数来生成这个数组. 解决方法
不确定你是怎么做的,但它似乎对我有用
直接从提示 a=np.zeros((2,6),dtype=np.float32) >>> a array([[ 0.,0.,0.],[ 0.,0.]],dtype=float32) >>> a[:,2]=1 >>> a array([[ 0.,1.,dtype=float32) (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |