大约有 40,000 项符合查询结果（耗时：0.0924秒） [XML]
Opposite of %in%: exclude rows with values specified in a vector
...
You can use the ! operator to basically make any TRUE FALSE and every FALSE TRUE. so:
D2 = subset(D1, !(V1 %in% c('B','N','T')))
EDIT:
You can also make an operator yourself:
'%!in%' <- function(x,y)!('%in%'(x,y))
c(1,3,11)%!in%1:10
[1] FALSE FALSE TRUE
...
In Python, how does one catch warnings as if they were exceptions?
...
To quote from the python handbook (27.6.4. Testing Warnings):
import warnings
def fxn():
warnings.warn("deprecated", DeprecationWarning)
with warnings.catch_warnings(record=True) as w:
# Cause all warnings to always be triggered.
warnings.sim...
Convert Elixir string to integer or float
...
Check Integer.parse/1 and Float.parse/1.
share
|
improve this answer
|
follow
|
...
How do I install a NuGet package into the second project in a solution?
I'm currently working on a solution that initially contained one project ( My.First.Project.Name ). I've installed Castle Windsor by executing:
...
How do I check what version of Python is running my script?
How can I check what version of the Python Interpreter is interpreting my script?
21 Answers
...
Syntax of for-loop in SQL Server
... edited Sep 19 '17 at 12:38
Kolappan N
1,83322 gold badges2323 silver badges2727 bronze badges
answered May 20 '11 at 7:57
...
Inserting a Python datetime.datetime object into MySQL
...me field, use:
import time
time.strftime('%Y-%m-%d %H:%M:%S')
I think strftime also applies to datetime.
share
|
improve this answer
|
follow
|
...
Return value in a Bash function
I am working with a bash script and I want to execute a function to print a return value:
9 Answers
...
What would a “frozen dict” be?
I guess it could be something like collections.namedtuple , but that is more like a frozen-keys dict (a half-frozen dict). Isn't it?
...
Why do python lists have pop() but not push()
Does anyone know why Python's list.append function is not called list.push given that there's already a list.pop that removes and returns the last element (that indexed at -1) and list.append semantic is consistent with that use?
...