大约有 47,000 项符合查询结果（耗时：0.0511秒） [XML]
Javascript seconds to minutes and seconds
...
To get the number of full minutes, divide the number of total seconds by 60 (60 seconds/minute):
var minutes = Math.floor(time / 60);
And to get the remaining seconds, multiply the full minutes with 60 and subtract from the total seconds:
var seconds = time - minutes * 60;
Now if you also wan...
C/C++ check if one bit is set in, i.e. int variable
Is there such a way to check if bit 3 in temp is 1 or 0 without bit shifting and masking.
21 Answers
...
How to create a video from images with FFmpeg?
...video filter instead of -r for the output framerate
ffmpeg -r 1/5 -i img%03d.png -c:v libx264 -vf fps=25 -pix_fmt yuv420p out.mp4
Alternatively the format video filter can be added to the filter chain to replace -pix_fmt yuv420p like "fps=25,format=yuv420p". The advantage of this method is th...
Selecting data frame rows based on partial string match in a column
...
150
I notice that you mention a function %like% in your current approach. I don't know if that's a r...
Warning: Found conflicts between different versions of the same dependent assembly
I am currently developing a .NET application, which consists of 20 projects. Some of those projects are compiled using .NET 3.5, some others are still .NET 2.0 projects (so far no problem).
...
What does the constant 0.0039215689 represent?
...
0.0039215689 is approximately equal to 1/255.
Seeing that this is OpenGL, performance is probably important. So it's probably safe to guess that this was done for performance reasons.
Multiplying by the reciprocal is faster...
What is the easiest way to push an element to the beginning of the array?
...
390
What about using the unshift method?
ary.unshift(obj, ...) → ary
Prepends objects to the...
How to fix the uninitialized constant Rake::DSL problem on Heroku?
...
205
Put this in your Rakefile above require 'rake':
require 'rake/dsl_definition'
...
What is “entropy and information gain”?
...
1051
I assume entropy was mentioned in the context of building decision trees.
To illustrate, imag...
Understanding slice notation
...
answered Feb 3 '09 at 22:48
Greg HewgillGreg Hewgill
783k167167 gold badges10841084 silver badges12221222 bronze badges
...