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Shuffle two list at once with same order
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I get a easy way to do this
import numpy as np
a = np.array([0,1,2,3,4])
b = np.array([5,6,7,8,9])
indices = np.arange(a.shape[0])
np.random.shuffle(indices)
a = a[indices]
b = b[indices]
# a, array([3, 4, 1, 2, 0])
# b, array([8, 9, 6, 7, 5])
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How to convert a Java 8 Stream to an Array?
What is the easiest/shortest way to convert a Java 8 Stream into an array?
10 Answers
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C# declare empty string array
I need to declare an empty string array and i'm using this code
9 Answers
9
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Why does “,,,” == Array(4) in Javascript?
...ht hand operand is converted to a string and the string representation of Array(4) is ,,,:
> Array(4).toString()
",,,"
If you use the array constructor function and pass a number, it sets the length of the array to that number. So you can say you have four empty indexes (same as [,,,]) and ...
PHP array_filter with arguments
... return $i < $this->num;
}
}
Usage (demo):
$arr = array(7, 8, 9, 10, 11, 12, 13);
$matches = array_filter($arr, array(new LowerThanFilter(12), 'isLower'));
print_r($matches);
As a sidenote, you can now replace LowerThanFilter with a more generic NumericComparisonFilter w...
Finding the index of elements based on a condition using python list comprehension
...I similar to Matlab's, you would use numpy, a package for multidimensional arrays and numerical math in Python which is heavily inspired by Matlab. You would be using a numpy array instead of a list.
>>> import numpy
>>> a = numpy.array([1, 2, 3, 1, 2, 3])
>>> a
array([1,...
Find html label associated with a given input
...FormElem').label.innerHTML = 'Look ma this works!';
No need for a lookup array :)
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Why doesn't indexOf work on an array IE8?
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Versions of IE before IE9 don't have an .indexOf() function for Array, to define the exact spec version, run this before trying to use it:
if (!Array.prototype.indexOf)
{
Array.prototype.indexOf = function(elt /*, from*/)
{
var len = this.length >>> 0;
var from = Nu...
Create a List of primitive int?
... Integer class which is a wrapper for int:
List<Integer> list = new ArrayList<Integer>();
If your using Java 7 you can simplify this declaration using the diamond operator:
List<Integer> list = new ArrayList<>();
With autoboxing in Java the primitive type int will becom...
How to create byte array from HttpPostedFile
... FromBinary method. Wondering how do I convert my input stream into a byte array
6 Answers
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