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What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?
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Which one ? BSR or CNTLZ ? As I read the x86-timing.pdf referenced above, BSR is only slow on the Netburst Pentiums. I know nothing about PowerPC though.
– timday
Mar 23 '09 at 9:26
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用Javascript获取页面元素的位置（全） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...表决定。
浏览器窗口的大小，则是指在浏览器窗口中看到的那部分网页面积，又叫做viewport（视口）。
很显然，如果网页的内容能够在浏览器窗口中全部显示（也就是不出现滚动条），那么网页的大小和浏览器窗口的大小是相...
Is a successor for TeX/LaTeX in sight? [closed]
... LuaTeX is not an alternative to LaTeX, it is an extended TeX engine (like pdftex, XeTeX) on which both LaTeX (then called LuaLaTeX) and ConTeXt can run. (I think it is the default for today's ConTeXt.)
– Paŭlo Ebermann
Oct 16 '11 at 17:40
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How do I get the picture size with PIL?
How do I get a size of a pictures sides with PIL or any other Python library?
7 Answers
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A weighted version of random.choice
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Since Python 3.6 there is a method choices from the random module.
Python 3.6.1 (v3.6.1:69c0db5050, Mar 21 2017, 01:21:04)
Type 'copyright', 'credits' or 'license' for more information
IPython 6.0.0 -- An enhanced Interactive Pytho...
How can I quantify difference between two images?
...ot, you may need to resize or crop them. PIL library will help to do it in Python.
If they are taken with the same settings and the same device, they are probably the same.
Are images well-aligned?
If not, you may want to run cross-correlation first, to find the best alignment first. SciPy has fun...
Does pandas iterrows have performance issues?
...pply
a) reductions that can be performed in cython
b) iteration in python space
4) itertuples
5) iterrows
6) updating an empty frame (e.g. using loc one-row-at-a-time)
Using a custom Cython routine is usually too complicated, so let's skip that for now.
1) Vectorization is ALWAYS, ALWAYS ...
How can I open the interactive matplotlib window in IPython notebook?
I am using IPython with --pylab=inline and would sometimes like to quickly switch to the interactive, zoomable matplotlib GUI for viewing plots (the one that pops up when you plot something in a terminal Python console). How could I do that? Preferably without leaving or restarting my notebook.
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How to handle exceptions in a list comprehensions?
I have some a list comprehension in Python in which each iteration can throw an exception.
6 Answers
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Change the name of a key in dictionary
I want to change the key of an entry in a Python dictionary.
15 Answers
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