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How do you calculate log base 2 in Java for integers?
...ons are not exact. You can never know for sure what will (int)(Math.log(65536)/Math.log(2)) evaluate to. For example, Math.ceil(Math.log(1<<29) / Math.log(2)) is 30 on my PC where mathematically it should be exactly 29. I didn't find a value for x where (int)(Math.log(x)/Math.log(2)) fails (j...
Array Size (Length) in C#
... is a rectangular multi-dimensional array (for example, int[,] b = new int[3, 5];)
b.Rank
will give the number of dimensions (2) and
b.GetLength(dimensionIndex)
will get the length of any given dimension (0-based indexing for the dimensions - so b.GetLength(0) is 3 and b.GetLength(1) is 5).
S...
How do Trigonometric functions work?
...ndard interval. For starters, you could reduce angles to be between 0 and 360 degrees. But by using a few identities, you realize you could get by with less. If you calculate sines and cosines for angles between 0 and 45 degrees, you can bootstrap your way to calculating all trig functions for all...
How to make Twitter Bootstrap tooltips have multiple lines?
... white-space:pre;
max-width:none;
}
http://jsfiddle.net/chad/TSZSL/53/
Neither of these will work with a \n in the html, they must actually be actual newlines. Alternatively, you can use encoded newlines &#013;, but that's probably even less desirable than using <br>'s.
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When to use os.name, sys.platform, or platform.system?
As far as I know, Python has 3 ways of finding out what operating system is running on:
5 Answers
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namedtuple and default values for optional keyword arguments
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553
Python 3.7
Use the defaults parameter.
>>> from collections import namedtuple
>>...
How to sum up an array of integers in C#
...
Provided that you can use .NET 3.5 (or newer) and LINQ, try
int sum = arr.Sum();
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How can I draw vertical text with CSS cross-browser?
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213
Updated this answer with recent information (from CSS Tricks). Kudos to Matt and Douglas for poi...
How to debug Lock wait timeout exceeded on MySQL?
...----------
SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 9014315, signal count 7805377
Mutex spin waits 0, rounds 11487096053, OS waits 7756855
RW-shared spins 722142, OS waits 211221; RW-excl spins 787046, OS waits 39353
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LATEST FOREIGN KEY ERROR
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The tilde operator in Python
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edited Apr 23 '12 at 22:55
answered Nov 29 '11 at 3:02
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