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lsof survival guide [closed]
lsof is an increadibly powerful command-line utility for unix systems. It lists open files, displaying information about them. And since most everything is a file on unix systems, lsof can give sysadmins a ton of useful diagnostic data.
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Finding duplicates in O(n) time and O(1) space
...e. A swap only occurs if there is an i such that A[i] != i, and each swap sets at least one element such that A[i] == i, where that wasn't true before. This means that the total number of swaps (and thus the total number of executions of the while loop body) is at most N-1.
The second loop prints...
When and why are database joins expensive?
...r special cases
It all comes back to mitigating the size of the working set. Joins involving properly selected keys with correctly set up indexes are cheap, not expensive, because they allow significant pruning of the result before the rows are materialised.
Materialising the result involves bu...
Get MD5 hash of big files in Python
... @user2084795 open always opens a fresh file handle with the position set to the start of the file, (unless you open a file for append).
– Steve Barnes
Jul 5 '17 at 9:15
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How do I tell git to always select my local version for conflicted merges on a specific file?
...g any local change)
Now, let's retry the merge from the beginning:
git reset --hard
HEAD is now at ec202aa prepare myBranch with .gitattributes merge strategy
git merge hisBranch
Auto-merging dirWithConflicts/a.txt
CONFLICT (content): Merge conflict in dirWithConflicts/a.txt
Auto-merging dirWithC...
Difference between Python's Generators and Iterators
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Some examples of iterables are the built-in tuples, lists, dictionaries, sets, frozen sets, strings, byte strings, byte arrays, ranges and memoryviews:
>>> all(isinstance(element, collections.Iterable) for element in (
(), [], {}, set(), frozenset(), '', b'', bytearray(), range(0...
Creating a UIImage from a UIColor to use as a background image for UIButton [duplicate]
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I created a category around UIButton to be able to set the background color of the button and set the state. You might find this useful.
@implementation UIButton (ButtonMagic)
- (void)setBackgroundColor:(UIColor *)backgroundColor forState:(UIControlState)state {
[self ...
android ellipsize multiline textview
...ut;
import android.text.TextUtils.TruncateAt;
import android.util.AttributeSet;
import android.widget.TextView;
public class EllipsizingTextView extends TextView {
private static final String ELLIPSIS = "...";
public interface EllipsizeListener {
void ellipsizeStateChanged(boolean ...
Check if UIColor is dark or bright?
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I used this code, worked perfectly, but dont know when I set [UIColor blackColor], it returns darknessScore = 149.685. Can you explain why this is happening ?
– DivineDesert
Jun 20 '14 at 20:02
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What is an intuitive explanation of the Expectation Maximization technique? [closed]
...from scipy import stats
np.random.seed(110) # for reproducible results
# set parameters
red_mean = 3
red_std = 0.8
blue_mean = 7
blue_std = 2
# draw 20 samples from normal distributions with red/blue parameters
red = np.random.normal(red_mean, red_std, size=20)
blue = np.random.normal(blue_mean,...