December 2016
Intermediate to advanced
332 pages
6h 2m
English
book
Scientific Computing with Python 3
by Claus Führer, Claus Fuhrer, Jan Erik Solem, Olivier Verdier
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Accessing array entries
Array entries are accessed by indexes. In contrast to vector coefficients two indexes are needed to access matrix coefficients. These are given in one pair of brackets. This distinguishes the array syntax from a list of lists. There, two pairs of brackets are needed to access elements.
M = array([[1., 2.],[3., 4.]]) M[0, 0] # first row, first column: 1. M[-1, 0] # last row, first column: 3.
Basic array slicing
Slices are similar to those of lists except that there might now be in more than one dimension:
M[i,:]is a vector filled by the row i of M.M[:,j]is a vector filled by the column i of M.M[2:4,:]is a slice of2:4on the rows only.M[2:4,1:4]is a slice on rows and columns.
The result of matrix slicing is given in the following ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.