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Compute a confidence interval from sample data
...assumptions for both are that the sample (array a) was drawn independently from a normal distribution with unknown standard deviation (see MathWorld or Wikipedia).
For large sample size n, the sample mean is normally distributed, and one can calculate its confidence interval using st.norm.interval(...
nodejs vs node on ubuntu 12.04
I installed nodejs on ubuntu from instructions given here
20 Answers
20
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Property getters and setters
...roperties; such properties do not have storage in the instance - the value from the getter is meant to be computed from other instance properties. In your case, there is no x to be assigned.
Explicitly: "How can I do this without explicit backing ivars". You can't - you'll need something to backu...
ByteBuffer.allocate() vs. ByteBuffer.allocateDirect()
...ects in Java, and
the way data is stored inside that
object could vary from one JVM
implementation to another.
For this reason, the notion of a
direct buffer was introduced. Direct
buffers are intended for interaction
with channels and native I/O routines.
They make a best effort ...
How to implement an STL-style iterator and avoid common pitfalls?
...riterator>, or put the same typedefs in the iterator itself, or inherit from std::iterator (which has these typedefs). I prefer the second option, to avoid changing things in the std namespace, and for readability, but most people inherit from std::iterator.
struct std::iterator_traits<youri...
Creating a UIImage from a UIColor to use as a background image for UIButton [duplicate]
...rState:(UIControlState)state {
[self setBackgroundImage:[UIButton imageFromColor:backgroundColor] forState:state];
}
+ (UIImage *)imageFromColor:(UIColor *)color {
CGRect rect = CGRectMake(0, 0, 1, 1);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurre...
How to create a GUID/UUID in Python
...
Copied from : https://docs.python.org/2/library/uuid.html (Since the links posted were not active and they keep updating)
>>> import uuid
>>> # make a UUID based on the host ID and current time
>>> uuid....
How do I find which rpm package supplies a file I'm looking for?
...NU versions of grep pattern matching utilities.
Repo : base
Matched from:
Filename : /bin/grep
You may prefer the output and speed of the repoquery tool, available in the yum-utils package.
sudo yum install yum-utils
repoquery --whatprovides '*bin/grep'
grep-0:2.5.1-55.el5.x86_64
grep-0...
Open another application from your own (intent)
...te an intent with action=MAIN and category=LAUNCHER
Get the PackageManager from the current context using context.getPackageManager
packageManager.queryIntentActivity(<intent>, 0) where intent has category=LAUNCHER, action=MAIN or packageManager.resolveActivity(<intent>, 0) to get the fi...
Constructing pandas DataFrame from values in variables gives “ValueError: If using all scalar values
...e I suppose a single-row DataFrame as shown here would also be ok to build from a dictionary because the order does not matter (but this hasn't been implemented). However with multiple rows, Pandas would not be able to make a DataFrame because it would not know which items belonged to the same row.
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