Introduction to NumPy arrays - GitHub
Introduction to NumPy arrays
Gert-Ludwig Ingold
Python comes with batteries included
? extensive Python standard library
What about batteries for scientists (and others as well)?
? scienti c Python ecosystem
+ SciKits and many other packages
from:
Python comes with batteries included
? extensive Python standard library
What about batteries for scientists (and others as well)?
? scienti c Python ecosystem
+ SciKits and many other packages
from:
Python comes with batteries included
? extensive Python standard library
What about batteries for scientists (and others as well)?
? scienti c Python ecosystem
+ SciKits and many other packages
from:
scipy-
docs.doc/numpy/
SciKits Numpy Matplotlib
SciPy
Python
2017
EDITION
Cython
IP[y]:
IPython
Scipy
Lecture Notes
scipy-
Edited by Ga?l Varoquaux Emmanuelle Gouillart Olaf Vahtras
Ga?l Varoquaux ? Emmanuelle Gouillart ? Olav Vahtras Christopher Burns ? Adrian Chauve ? Robert Cimrman ? Christophe Combelles Pierre de Buyl ? Ralf Gommers ? Andr? Espaze ? Zbigniew Jdrzejewski-Szmek
Valentin Haenel ? Gert-Ludwig Ingold ? Fabian Pedregosa ? Didrik Pinte Nicolas P. Rougier ? Pauli Virtanen
and many others...
A wish list
we want to work with vectors and matrices
a11 a12 ? ? ? a1n a21 a22 ? ? ? a2n ... ... . . . ...
an1 an2 ? ? ? ann
we want our code to run fast we want support for linear algebra ...
colour image as N ? M ? 3-array
List indexing
0
1
2
-N -N+1 -N+2
N-3 N-2 N-1 -3 -2 -1
indexing starts at 0 negative indices count from the end of the list to the beginning
List slicing
basic syntax: [start:stop:step]
a[0:5]
a[5:8]
01234567
012345678
if step=1 slice contains the elements start to stop-1 slice contains stop-start elements
start, stop, and also step can be negative
default values:
start 0, i.e. starting from the rst element
stop
N, i.e up to and including the last element
step
1
................
................
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