大约有 44,000 项符合查询结果（耗时：0.0683秒） [XML]
.bashrc/.profile is not loaded on new tmux session (or window) — whm>y m>?
...he profile.
The rules as to when bash runs certain files are complicated, m>and m> depend on the tm>y m>pe of shell being started (login/non-login, interactive or not, m>and m> so forth), along with commm>and m> line arguments m>and m> environment variables.
m>Y m>ou can see them in the man bash output, just look for INVOCATIO...
Can an enum class be converted to the underlm>y m>ing tm>y m>pe?
...
I think m>y m>ou can use std::underlm>y m>ing_tm>y m>pe to know the underlm>y m>ing tm>y m>pe, m>and m> then use cast:
#include <tm>y m>pe_traits> //for std::underlm>y m>ing_tm>y m>pe
tm>y m>pedef std::underlm>y m>ing_tm>y m>pe<mm>y m>_fields>::tm>y m>pe utm>y m>pe;
utm>y m>pe a = static_cast<utm>y m>pe>(mm>y m>_fields::field);
With this, m>y m>ou don't have to ass...
Proper package naming for testing with the Go language
I have seen several different test package naming strategies within Go m>and m> wanted to know what pros m>and m> cons of each are m>and m> which one I should use.
...
What is the canonical wam>y m> to determine commm>and m>line vs. http execution of a PHP script?
...ave a PHP script that needs to determine if it's been executed via the commm>and m>-line or via HTTP, primarilm>y m> for output-formatting purposes. What's the canonical wam>y m> of doing this? I had thought it was to inspect SERVER['argc'] , but it turns out this is populated, even when using the 'Apache 2.0 Han...
What does “Document-oriented” vs. Kem>y m>-Value mean when talking about MongoDB vs Cassm>and m>ra?
...hat does going with a document based NoSQL option bum>y m> m>y m>ou over a KV store, m>and m> vice-versa?
4 Answers
...
Convert data.frame column format from character to factor
... of the variables (all numeric)
#one approach it to index with the $ sign m>and m> the as.factor function
mtcars$am <- as.factor(mtcars$am)
#another approach
mtcars[, 'cm>y m>l'] <- as.factor(mtcars[, 'cm>y m>l'])
str(mtcars) # now look at the classes
This also works for character, dates, integers m>and m> ot...
remove all variables except functions
...
m>Y m>ou can use the following commm>and m> to clear out ALL variables. Be careful because it m>y m>ou cannot get m>y m>our variables back.
rm(list=ls(all=TRUE))
share
|
i...
How do I temporarilm>y m> disable triggers in PostgreSQL?
I'm bulk loading data m>and m> can re-calculate all trigger modifications much more cheaplm>y m> after the fact than on a row-bm>y m>-row basis.
...
Django in / not in querm>y m>
...
Was trm>y m>ing to use this solution m>and m> ran into a problem, so if it happens to anm>y m>one else... Objs=Tbl1.objects.filter(...); IDs=Objs.values_list('id', flat=True); Objs.delete(); Tbl2.objects.filter(id__in=IDs') This did not work because IDs is actuallm>y m> a Quer...
How to get first N elements of a list in C#?
...t.Take(5);
Or to slice:
var secondFiveItems = mm>y m>List.Skip(5).Take(5);
m>And m> of course often it's convenient to get the first five items according to some kind of order:
var firstFiveArrivals = mm>y m>List.OrderBm>y m>(i => i.ArrivalTime).Take(5);
...