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Fastest way to replace NAs in a large data.table
...d at NAToUnknown).
EDIT (more elegant solution as requested by Ramnath in comments) :
f_dowle2 = function(DT) {
for (i in names(DT))
DT[is.na(get(i)), (i):=0]
}
system.time(f_dowle2(dt1))
user system elapsed
6.468 0.760 7.250 # faster, too
identical(a_gdata, dt1)
[1] TRUE
I...
How to organize a node app that uses sequelize?
...)
It's old and limited in many ways!
First, as @jinglesthula mentioned in comments (and I experienced it too) - there are problems with requiring those files. It's because require doesn't work the same way as readdirSync!
Second - you are very limited in relations - the code doesn't provide option...
Shiro vs. SpringSecurity [closed]
...ld be the right Choice, but Spring security seems to suffer from excessive complexity, it certainly does not seem like it is making security easier to implement, Shiro seems to be much more coherent and easier to understand. I am looking for lists of pros and cons between these two frameworks.
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Can enums be subclassed to add new elements?
...have a base class called e.g. IntEnum, that looks like this: stackoverflow.com/questions/1681976/enum-with-int-value-in-java/…. Then all my enums could extend it...in this case just benefitting from inheritance and thus I wouldn't have to duplicate this "int-based enum" code frequently. I am new...
Python subprocess.Popen “OSError: [Errno 12] Cannot allocate memory”
...or because security_vm_enough_memory_mm failed you while enforcing the overcommit policy.
Start by checking the vmsize of the process that failed to fork, at the time of the fork attempt, and then compare to the amount of free memory (physical and swap) as it relates to the overcommit policy (plug ...
Why is #!/usr/bin/env bash superior to #!/bin/bash?
I've seen in a number of places, including recommendations on this site ( What is the preferred Bash shebang? ), to use #!/usr/bin/env bash in preference to #!/bin/bash . I've even seen one enterprising individual suggest using #!/bin/bash was wrong and bash functionality would be lost by doing...
Instance attribute attribute_name defined outside __init__
... But when I do that (initialize to None the attributes), mypy complains, any suggestions on how to fix both issues at the same time?
– pablete
Mar 20 at 15:05
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Alarm 闹钟扩展 · App Inventor 2 中文网
...
尽管Android文档强烈建议使用通知（参见 developer.android.com），但在某些情况下，仍然需要在特定时间启动应用程序。使用此扩展，可以在指定时间启动应用程序。如果您想定时生成通知，必须使用扩展 UrsAI2Notifier。
⚠...
C# switch statement limitations - why?
... switch statement is not always a constant time branch.
In some cases the compiler will use a CIL switch statement which is indeed a constant time branch using a jump table. However, in sparse cases as pointed out by Ivan Hamilton the compiler may generate something else entirely.
This is actuall...