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Scala how can I count the number of occurrences in a list
...
list.groupBy(i=>i).mapValues(_.size)
gives
Map[Int, Int] = Map(1 -> 1, 2 -> 3, 7 -> 1, 3 -> 1, 4 -> 3)
Note that you can replace (i=>i) with built in identity function:
list.groupBy(identity).mapValues(_.size)
...
How do I calculate percentiles with python/numpy?
...
You might be interested in the SciPy Stats package. It has the percentile function you're after and many other statistical goodies.
percentile() is available in numpy too.
import numpy as np
a = np.array([1,2,3,4,5])
p = np.percentile(a...
Using the field of an object as a generic Dictionary key
...o : IEquatable<Foo> {
public string Name { get; set;}
public int FooID {get; set;}
public override int GetHashCode() {
return FooID;
}
public override bool Equals(object obj) {
return Equals(obj as Foo);
}
public bool Equals(Foo obj) {
retur...
What is the difference between UTF-8 and ISO-8859-1?
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I had seen where Umlaut's are not supposedly converted with UTF8. We saw examples of this and in searching we found the ISO-8859-1 and it seems to work. We have a lot of German Scientist we work with.
– Aggie Jon of 87
Jul 25 '18...
Is there a way of making strings file-path safe in c#?
... = new string(filename.Select(ch => invalidFileNameChars.Contains(ch) ? Convert.ToChar(invalidFileNameChars.IndexOf(ch) + 65) : ch).ToArray());
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The multi-part identifier could not be bound
...(
SELECT
maxa,
COUNT(*) AS tong
FROM khaosat
WHERE CONVERT(datetime, ngaylap, 103) BETWEEN 'Sep 1 2011' AND 'Sep 5 2011'
GROUP BY maxa
) AS dkcd ON dkcd.maxa = a.maxa
WHERE a.maxa <> '99'
ORDER BY a.maxa
Here the tables a and b are joined first, then the result ...
WPF Button with Image
...ImageLocationProperty, WpfImageButton.ImageLocation.Left);
}
public int ImageWidth
{
get { return (int)GetValue(ImageWidthProperty); }
set { SetValue(ImageWidthProperty, value); }
}
public static readonly DependencyProperty ImageWidthProperty =
DependencyPropert...
Migrating from JSF 1.2 to JSF 2.0
...not present, then scan for *.jsp file. This provides you room to gradually convert from JSP to Facelets behind the scenes without changing the URL's.
But if you're using a prefix url-pattern, like /faces/* and you want to gradually upgrade from JSP to Facelets, then you really have to change it to...
How to find the type of an object in Go?
...hods for inspecting the type of variables.
The following snippet will print out the reflection type of a string, integer and float.
package main
import (
"fmt"
"reflect"
)
func main() {
tst := "string"
tst2 := 10
tst3 := 1.2
fmt.Println(reflect.TypeOf(tst))
fmt.Pr...
How to set size for local image using knitr for markdown?
...hat I would like to include in an .Rmd file which I will then knit and convert to HTML slides with Pandoc . Per this post , this will insert the local image :
...