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How to get Bitmap from an Uri?
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What about converting the URI to an url, e.g by using yourUri.toURL() ?
– Vidar Vestnes
Oct 7 '10 at 15:05
7
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Are tuples more efficient than lists in Python?
...efficient.
This gives tuples a nice space advantage:
>>> import sys
>>> sys.getsizeof(tuple(iter(range(10))))
128
>>> sys.getsizeof(list(iter(range(10))))
200
Here is the comment from Objects/listobject.c that explains what lists are doing:
/* This over-allocates prop...
Scala 2.8 breakOut
...hat would produce an intermediary List[(Int, String)] collection, and then convert it.
Given that map uses a Builder to produce the resulting collection, wouldn't it be possible to skip the intermediary List and collect the results directly into a Map? Evidently, yes, it is. To do so, however, we n...
SQL command to display history of queries
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cat ~/.mysql_history
this will show you all mysql commands ran on the system
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How do I list all the columns in a table?
For the various popular database systems, how do you list all the columns in a table?
12 Answers
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ValueError: setting an array element with a sequence
...2,3]) #good
numpy.array([1, (2,3)]) #Fail, can't convert a tuple into a numpy
#array element
numpy.mean([5,(6+7)]) #good
numpy.mean([5,tuple(range(2))]) #Fail, can't convert a tuple into a numpy
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How to include (source) R script in other scripts
...e, checks to see if the file has been loaded into the environment and uses sys.source to source the file if not.
Here's a quick and untested function (improvements welcome!):
include <- function(file, env) {
# ensure file and env are provided
if(missing(file) || missing(env))
stop("'fil...
hexadecimal string to byte array in python
...ex string that represents a series of values of different types. I wish to convert this Hex String into a byte array so that I can shift each value out and convert it into its proper data type.
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How do I get whole and fractional parts from double in JSP/Java?
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Converting double to int is almost always a bad idea. Because e.g. for (long)1.0e100 you will get 0. A lot of the times you need the double value simply "floored" for which there is floor(). If you want both integral and frac...
Cannot find module cv2 when using OpenCV
I have installed OpenCV on the Occidentalis operating system (a variant of Raspbian) on a Raspberry Pi, using jayrambhia's script found here . It installed version 2.4.5.
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