大约有 30,000 项符合查询结果（耗时：0.0241秒） [XML]
The simplest possible JavaScript countdown timer? [closed]
Just wanted to ask how to create the simplest possible countdown timer.
3 Answers
3
...
How to determine CPU and memory consumption from inside a process?
...ULL, &cpuQuery);
// You can also use L"\\Processor(*)\\% Processor Time" and get individual CPU values with PdhGetFormattedCounterArray()
PdhAddEnglishCounter(cpuQuery, L"\\Processor(_Total)\\% Processor Time", NULL, &cpuTotal);
PdhCollectQueryData(cpuQuery);
}
double getCurrent...
Legality of COW std::string implementation in C++11
...
-1 The logic doesn't hold water. At the time of a COW copying there are no references or iterators that can be invalidated, the whole point of doing the copying is that such references or iterators are now being obtained, so copying is necessary. But it may still b...
Scala best way of turning a Collection into a Map-by-key?
...n my machine for a list with 500,000 elements, this Scala code is about 20 times slower than the straight-forward Java approach (create HashMap with appropriate size, loop over list, put elements into map). For 5,000 elements, Scala ist about 8 times slower. The loop approach written in Scala is rou...
Using arrays or std::vectors in C++, what's the performance gap?
...r micro-optimizer people
Remember:
"Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered. We should forget...
Way to read first few lines for pandas dataframe
...first n lines of a file without knowing the length of the lines ahead of time? I have a large file that takes a long time to read, and occasionally only want to use the first, say, 20 lines to get a sample of it (and prefer not to load the full thing and take the head of it).
...
Rolling or sliding window iterator?
...win
In my tests it handily beats everything else posted here most of the time, though pillmuncher's tee version beats it for large iterables and small windows. On larger windows, the deque pulls ahead again in raw speed.
Access to individual items in the deque may be faster or slower than with li...
Why is string concatenation faster than array join?
...vily optimized C++ code. It's too long to quote here, but search in the runtime.cc file for RUNTIME_FUNCTION(MaybeObject*, Runtime_StringBuilderConcat) to see the code.
share
|
improve this answer
...
Ruby, remove last N characters from a string?
...tly accept a regex so if you don't know the suffix it's not viable for the time being. However, as the accepted answer (update: at the time of writing) dictates the same, I thought this might be useful to some people.
share
...
adding noise to a signal in python
...plot(t, x_volts)
plt.title('Signal')
plt.ylabel('Voltage (V)')
plt.xlabel('Time (s)')
plt.show()
x_watts = x_volts ** 2
plt.subplot(3,1,2)
plt.plot(t, x_watts)
plt.title('Signal Power')
plt.ylabel('Power (W)')
plt.xlabel('Time (s)')
plt.show()
x_db = 10 * np.log10(x_watts)
plt.subplot(3,1,3)
plt.p...