November 2023
Intermediate to advanced
576 pages
13h 30m
German
Content preview from Handbuch Data Science mit Python
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KAPITEL 8
Berechnungen mit Arrays: Broadcasting
In Kapitel 6 haben Sie erfahren, wie sich NumPys UFuncs zum Vektorisieren von Operationen verwenden lassen, und dabei langsame Python-Schleifen entfernt. In diesem Kapitel geht es um Broadcasting: verschiedene Regeln, anhand derer Sie mit NumPy binäre Operationen (Addition, Subtraktion, Multiplikation usw.) auf Arrays unterschiedlicher Größe anwenden können.
Kurz vorgestellt: Broadcasting
Wie Sie wissen, werden binäre Operationen bei Arrays gleicher Größe elementweise durchgeführt:
In [1]: import numpy as np
In [2]: a = np.array([0, 1, 2])
b = np.array([5, 5, 5])
a + b
Out[2]: array([5, 6, 7])
Broadcasting ermöglicht die Anwendung solcher binären Operationen auf Arrays unterschiedlicher Größe ...
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