大约有 45,000 项符合查询结果（耗时：0.0568秒） [XML]
Pass a data.frame column name to a function
... just use the column name directly:
df <- data.frame(A=1:10, B=2:11, C=3:12)
fun1 <- function(x, column){
max(x[,column])
}
fun1(df, "B")
fun1(df, c("B","A"))
There's no need to use substitute, eval, etc.
You can even pass the desired function as a parameter:
fun1 <- function(x, colu...
MongoDB, remove object from array
...': ObjectId("5150a1199fac0e6910000002")},
{ $pull: { "items" : { id: 23 } } },
false,
true
);
share
|
improve this answer
|
follow
|
...
Case Insensitive Flask-SQLAlchemy Query
...
3 Answers
3
Active
...
Visual Studio jump to next error shortcut?
...
3 Answers
3
Active
...
Difference between size_t and std::size_t
...
3 Answers
3
Active
...
Plot a bar using matplotlib using a dictionary
...
import matplotlib.pyplot as plt
D = {u'Label1':26, u'Label2': 17, u'Label3':30}
plt.bar(range(len(D)), list(D.values()), align='center')
plt.xticks(range(len(D)), list(D.keys()))
# # for python 2.x:
# plt.bar(range(len(D)), D.values(), align='center') # python 2.x
# plt.xticks(range(len(D)), D.k...
github markdown colspan
...
| One | Two | Three | Four | Five | Six
| -
| Span <td colspan=3>triple <td colspan=2>double
So you can omit closing </td> for speed, оr can leave for consistency.
Result from http://markdown-here.com/livedemo.html :
Works in Jupyter Markdown.
Update:
As of 2019 y...
Is it safe to assume strict comparison in a JavaScript switch statement?
...
3 Answers
3
Active
...
How to return a 200 HTTP Status Code from ASP.NET MVC 3 controller
...
393
In your controller you'd return an HttpStatusCodeResult like this...
[HttpPost]
public Action...