Startseite Beiträge getaggt mit "Array"

Schlagwort: Array

[Raspberry Pi] Vektoren und Matrizen verarbeiten 

import numpy as np
from numpy.random import rand
from numpy.linalg import solve, inv

# Vektor
a = np.array([1, 2, 3, 5])
# Vektor mit äquidistanten Werte erzeugen
b = np.linspace(0, 2, 4)

print(a)
print(b)

# Vektor generieren
v = np.linspace(-np.pi, np.pi, 10)
vs = np.sin(v)
vc = np.cos(v)

print(v)
print(vs)
print(vc)

# Matrix
c = np.array([[1, 2, 3], [3, 4, 5], [6, 7, 8]])
# transponieren
d = c.transpose()
# invertieren
e = inv(c)

print(d)
print(e)

Links

[JavaScript] Assoziatives Array

Array

// Definition
let language = new Array();
language["DE"] = "Guten Morgen";
language["EN"] = "Good morning";
language["IT"] = "Buongiorno";
language["FR"] = "Bonjour";

// Guten Morgen User!
console.log(language["DE"] + " " + "User!");

// ["DE","EN","IT","FR"]
var aKeys = Object.keys(language);
console.log(JSON.stringify(aKeys));

// 12
console.log(language["DE"].length);
// 0
console.log(language.length);

Object

// Definition
let language = new Object();
language["DE"] = "Guten Morgen";
language["EN"] = "Good morning";
language["IT"] = "Buongiorno";
language["FR"] = "Bonjour";

// Guten Morgen User!
console.log(language["DE"] + " " + "User!");

// ["DE","EN","IT","FR"]
var aKeys = Object.keys(language);
console.log(JSON.stringify(aKeys));

// 12
console.log(language["DE"].length);
// undefined
console.log(language.length);

[JavaScript] Array filtern 

// Alter, nach dem das Personenarray gefiltert werden soll
let filter_age = 60;

// Array mit Namen und Alter
let arr_persons = [ { name:"Horst", age:50 },
                    { name:"Udo", age:55 },
                    { name:"Heinz", age:60 },
                    { name:"Ede", age:65 } ];

// neues, gefiltertes Array
let arr_filtered = arr_persons.filter( function(p){
  return p.age >= filter_age;
} );

// Ausgabe des gefilterten Arrays
arr_filtered.forEach(function(p){
  console.log(p.name + ": " + p.age);
});

[JavaScript] Array sortieren 

// https://www.w3schools.com/jsref/jsref_sort.asp

// einfaches Sortieren
let arr = ['rot', 'grün', 'blau'];
arr.sort();
console.log(arr);

// über compare-Funktion sortieren
let arr = [20, 10, 1, 4, 8, 70];
// aufsteigend
arr.sort(function(a, b) { return a-b; } );
console.log(arr);

let arr = [20, 10, 1, 4, 8, 70];
// absteigend
arr.sort(function(a, b) { return b-a; } );
console.log(arr);