我在填充大熊猫DataFrame
时遇到了一些麻烦。我按照发现here的说明生成MultiIndex
DataFrame
。该示例正常工作,除了我想要一个数组而不是一个值。
activity = 'Open_Truck'
id = 1
index = pd.MultiIndex.from_tuples([(activity, id)], names=['activity', 'id'])
v = pd.Series(np.random.randn(1, 5), index=index)
例外:数据必须是1维的
如果我将randn(1, 5)
替换为randn(1)
,则可以正常使用。对于randn(1, 1)
,我应该使用randn(1, 1).flatten('F')
但也可以使用v = pd.Series(np.random.randn(1, 5).flatten('F'), index=index)
。
尝试时:
np.array
ValueError:传递的项目数量错误5,展示位置意味着1
我的目的是为每行中的np.random.randn
和activity
添加1个特征向量(当然,它们在实际案例中为id
,而不是MultiIndex
)。
那么,我如何设法在DataFrame
Series
?
编辑:
由于我是大熊猫的新手,我将DataFrame
与DataFrame
混合在一起。我可以使用默认为二维的arrays = [np.array(['Open_Truck']*2),
np.array(['1', '2'])]
df = pd.DataFrame(np.random.randn(2, 4), index=arrays)
df
0 1 2 3
Open 1 -0.210923 0.184874 -0.060210 0.301924
2 0.773249 0.175522 -0.408625 -0.331581
来实现上述目的:
class Dashboard extends React.Component {
constructor(props) {
super(props);
this.state = {
// ...
serviceHTTPSCa: "",
serviceHTTPSCaError: ""
}
// ...
this.handleChangeServiceHTTPSCa = this.handleChangeServiceHTTPSCa.bind(this);
}
handleChangeServiceHTTPSCa(event) {
if (event.target.value.match(/^([a-z0-9_-]+).crt$/i)) {
this.setState({
serviceHTTPSCa: event.target.value,
serviceHTTPSCaError: "",
});
} else {
this.setState({
serviceHTTPSCaError: "Invalid format!"
});
}
}
render() {
return (
<div>
{/* some other markup */}
<TextField
hintText="Service https Ca..."
fullWidth={true}
value={this.state.serviceHTTPSCa}
onChange={this.handleChangeServiceHTTPSCa}
errorText={this.serviceHTTPSCaError}
type="text"
/>
{/* some other markup */}
</div>
);
}
}
答案 0 :(得分:1)
有问题class ViewController: UIViewController {
let views: [UIView] = [
{ let view = UIView(); view.backgroundColor = .red; return view; }(),
{ let view = UIView(); view.backgroundColor = .green; return view; }(),
{ let view = UIView(); view.backgroundColor = .blue; return view; }()
]
lazy var stackView: UIStackView = {
let stackView = UIStackView(frame: CGRect(x: 50.0, y: 100.0, width: 300.0, height: 200.0))
self.view.addSubview(stackView)
stackView.backgroundColor = .black
stackView.distribution = .fillEqually
return stackView
}()
override func viewDidLoad() {
super.viewDidLoad()
stackView.addArrangedSubview(views[0])
stackView.addArrangedSubview(views[1])
stackView.addArrangedSubview(views[2])
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
super.touchesBegan(touches, with: event)
UIView.animate(withDuration: 0.3) {
if self.stackView.arrangedSubviews.count == 3 {
self.views[1].alpha = 0.0
self.stackView.removeArrangedSubview(self.views[1])
} else {
self.views[1].alpha = 1.0
self.stackView.insertArrangedSubview(self.views[1], at: 1)
}
self.stackView.layoutIfNeeded()
}
}
}
只有一个元组,数据长度不同,MultiIndex
所以长度不匹配:
5
在第一个aproach长度相同,activity = 'Open_Truck'
id = 1
#get 5 times tuples
index = pd.MultiIndex.from_tuples([(activity, id)] * 5, names=['activity', 'id'])
print (index)
MultiIndex(levels=[['Open_Truck'], [1]],
labels=[[0, 0, 0, 0, 0], [0, 0, 0, 0, 0]],
names=['activity', 'id'])
print (len(index))
5
v = pd.Series(np.random.randn(1, 5).flatten('F'), index=index)
print (v)
activity id
Open_Truck 1 -1.348832
1 -0.706780
1 0.242352
1 0.224271
1 1.112608
dtype: float64
,因为列表中有一个元组:
1