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Java HashMap performance optimization / alternative
...around 20,000 codes for 26 million distinct objects. That is an average of 1,300 objects per hash bucket = very very bad. However if I turn the two arrays into a number in base 52 I am guaranteed to get a unique hash code for every object:
public int hashCode() {
// assume that both a an...
Specify width in *characters*
...
1em is the height of an M, rather than the width. Same holds for ex, which is the height of an x. More generally speaking, these are the heights of uppercase and lowercase letters.
Width is a totally different issue....
Cha...
Swift Beta performance: sorting arrays
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461
tl;dr Swift 1.0 is now as fast as C by this benchmark using the default release optimisation lev...
Generate a random double in a range
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241
To generate a random value between rangeMin and rangeMax:
Random r = new Random();
double rando...
Is there StartsWith or Contains in t sql with variables?
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123
StartsWith
a) left(@edition, 15) = 'Express Edition'
b) charindex('Express Edition', @edition...
What is the 'pythonic' equivalent to the 'fold' function from functional programming?
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119
The Pythonic way of summing an array is using sum. For other purposes, you can sometimes use s...
Hash collision in git
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111
Picking atoms on 10 Moons
An SHA-1 hash is a 40 hex character string... that's 4 bits per char...
How to center the content inside a linear layout?
... android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center" >
<ImageView
android:id="@+id/imageButton_speak"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
andr...
Map function in MATLAB?
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133
The short answer: the built-in function arrayfun does exactly what your map function does for ...