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What is the difference between NaN and None?
... which basically disables all efficiency in numpy.
So repeat 3 times fast: object==bad, float==good
Saying that, many operations may still work just as well with None vs NaN (but perhaps are not supported i.e. they may sometimes give surprising results):
In [15]: s_bad.sum()
Out[15...
Why do you not use C for your web apps?
...a not far away), finding the right API call is a challenge on its own. The time wasted to find this (and then to find how badly the native API call is implemented), the time to learn by hart it for the next time you need it, all this time is depriving you from the time necessary to resolve your appl...
Avoid trailing zeroes in printf()
...ision.
Power to the 0.5 rounding.
EDIT
Ok, this answer was edited a few times and I lost track what I was thinking a few years back (and originally it did not fill all the criteria). So here is a new version (that fills all criteria and handles negative numbers correctly):
double f = 1234.056789...
push_back vs emplace_back
... we have to repeatedly
include subheaders. Due to a
combination of our time constraints
and compilation speed concerns, we
haven't simulated variadic templates
in our emplace functions.
When variadic templates are
implemented in the compiler, you can
expect that we'll take advanta...
How to delete multiple buffers in Vim?
...
I too had a need for this functionality all the time. This is the solution I have in my vimrc.
function! GetBufferList()
return filter(range(1,bufnr('$')), 'buflisted(v:val)')
endfunction
function! GetMatchingBuffers(pattern)
return filter(GetBufferList(), 'bufn...
Get time difference between two dates in seconds
.../ Do your operations
var endDate = new Date();
var seconds = (endDate.getTime() - startDate.getTime()) / 1000;
Or even simpler (endDate - startDate) / 1000 as pointed out in the comments unless you're using typescript.
The explanation
You need to call the getTime() method for the Date objects, a...
git: Your branch is ahead by X commits
...out understanding the situation, you are potentially producing trouble for times ahead (rewritten history!). If you understand the situation, this will not be the fix for it. Please think before you type when using git, and don't ever mindlessly rewrite history!
– cmaster - rei...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
... as a key. There may be many reads in-flight, and we want to store a start timestamp to each. How? We could construct a unique identifier for each read, and use that as the key. But because kernel threads can only be executing one syscall at a time, we can use the thread ID as the unique identifier,...
How can I swap positions of two open files (in splits) in vim?
...
I wish I could upvote you ten times! I did have to use noremap in the mappings to make it work. Not sure why, but hopefully that helps anyone who finds this later. :D
– wes
Feb 5 '11 at 23:28
...
Oracle Differences between NVL and Coalesce
... | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-----------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 2 | 52 | 2 (0)| 00:00:01 |
| 1 | CONCATENATION ...