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How do I write a correct micro-benchmark in Java?
...ot:
Rule 0: Read a reputable paper on JVMs and micro-benchmarking. A good one is Brian Goetz, 2005. Do not expect too much from micro-benchmarks; they measure only a limited range of JVM performance characteristics.
Rule 1: Always include a warmup phase which runs your test kernel all the way thro...
How to use SVN, Branch? Tag? Trunk?
...re -- about 20 developers spread across 4 - 6 projects. I didn't find any one good source with ''the answer''. Here are some parts of how our answer has developed over the last 3 years:
-- commit as often as is useful; our rule of thumb is commit whenever you have done sufficient work that it wou...
Python: fastest way to create a list of n lists
... in xrange(n)]
is
from itertools import repeat
d = [[] for i in repeat(None, n)]
It does not have to create a new int object in every iteration and is about 15 % faster on my machine.
Edit: Using NumPy, you can avoid the Python loop using
d = numpy.empty((n, 0)).tolist()
but this is actuall...
How do I prevent an Android device from going to sleep programmatically?
...
One option is to use a wake lock. Example from the docs:
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
wl.ac...
How to implement the --verbose or -v option into a script?
... print arg,
print
else:
verboseprint = lambda *a: None # do-nothing function
(Yes, you can define a function in an if statement, and it'll only get defined if the condition is true!)
If you're using Python 3, where print is already a function (or if you're willing to ...
Data structure: insert, remove, contains, get random element, all at O(1)
...value to be removed. Set A[i]=d, H[d]=i, decrease the size of the array by one, and remove value from H.
contains(value): return H.contains(value)
getRandomElement(): let r=random(current size of A). return A[r].
since the array needs to auto-increase in size, it's going to be amortize O(1) to add...
Select first 4 rows of a data.frame in R
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This also works if you want the first four rows from just one column. To get the first four response values: df[1:4, "Response"].
– Iain Samuel McLean Elder
Mar 14 '14 at 1:04
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How do I size a UITextView to its content?
...nform to its content? Say for instance I have a UITextView that contains one line of text:
39 Answers
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Sort array of objects by object fields
How can I sort this array of objects by one of its fields, like name or count ?
19 Answers
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How to set an iframe src attribute from a variable in AngularJS
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...but this one works when I pass it into the ng-src attribute! Thanks.
– emersonthis
Nov 19 '13 at 12:23
2
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