大约有 30,000 项符合查询结果（耗时：0.0401秒） [XML]
why is plotting with Matplotlib so slow?
...matplotlib and I'm quite disappointed with the performance. The following em>x m>ample is modified from SciPy em>x m>amples and gives me only ~ 8 frames per second!
...
Python: Get the first character of the first string in a list?
... myarray[0][1:3]
'la'
Many people get tripped up here because they are mim>x m>ing up operators of Python list objects and operators of Numpy ndarray objects:
Numpy operations are very different than python list operations.
Wrap your head around the two conflicting worlds of Python's "list slicing,...
Drawing an image from a data URL to a canvas
...ge or purely in JS) by setting the src of the image to your data URL. For em>x m>ample:
var img = new Image;
img.src = strDataURI;
The drawImage() method of HTML5 Canvas Contem>x m>t lets you copy all or a portion of an image (or canvas, or video) onto a canvas.
You might use it like so:
var myCanvas = d...
How to make an OpenGL rendering contem>x m>t with transparent background?
Rendering contem>x m>ts usually have a solid color on the background (black or whatever, see the image below):
9 Answers
...
How do I create an empty array/matrim>x m> in NumPy?
I can't figure out how to use an array or matrim>x m> in the way that I would normally use a list. I want to create an empty array (or matrim>x m>) and then add one column (or row) to it at a time.
...
Case insensitive access for generic dictionary
...r);
Or create a new case-insensitive dictionary with the contents of an em>x m>isting case-sensitive dictionary (if you're sure there are no case collisions):-
var oldDictionary = ...;
var comparer = StringComparer.OrdinalIgnoreCase;
var newDictionary = new Dictionary<string, int>(oldDictionary,...
How to get em>x m>ecution time in rails console?
I want compare time of em>x m>ecution Post.all and SELECT * FROM posts (or some other statements) How can i get em>x m>ecution time of Post.all ?
...
Return two and more values from a method
...
def sumdiff(m>x m>, y)
return m>x m>+y, m>x m>-y
end
#=> nil
sumdiff(3, 4)
#=> [7, -1]
a = sumdiff(3,4)
#=> [7, -1]
a
#=> [7, -1]
a,b=sumdiff(3,4)
#=> [7, -1]
a
#=> 7
b
#=> -1
a,b,c=sumdiff(3,4)
#=> [7, -1]
a
#=> 7
b
#=...
Qt: How do I handle the event of the user pressing the 'm>X m>' (close) button?
... don't know which slot corresponds to the event of "the user clicking the 'm>X m>'(close) button of the window frame" i.e. this button:
...
Why does struct alignment depend on whether a field type is primitive or user-defined?
...ess that's a multiple of 8 bytes in 64-bit mode. It occurs even when you em>x m>plicitly apply the [StructLayout(LayoutKind.Sequential)] attribute. That is not supposed to happen.
You can see it by making the struct members public and appending test code like this:
var test = new RefAndTwoInt32Wr...