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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...
Generate a random double in a range
...
241
To generate a random value between rangeMin and rangeMax:
Random r = new Random();
double rando...
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...
Mapping over values in a python dictionary
Given a dictionary { k1: v1, k2: v2 ... } I want to get { k1: f(v1), k2: f(v2) ... } provided I pass a function f .
7 ...
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 ...
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...
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...
Eclipse: Referencing log4j.dtd in log4j.xml
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177
I know this question has been answered, but I'd like to provide my slightly different alternat...
How to count duplicate value in an array in javascript
... }
current = array_elements[i];
cnt = 1;
} else {
cnt++;
}
}
if (cnt > 0) {
document.write(current + ' comes --> ' + cnt + ' times');
}
}
count();
Demo Fiddle
You can use higher-order fun...