Scientific Python @SciPyTip
Tweets about SciPy (Scientific Python) and related topics from @JohnDCook. JohnDCook.com Houston Joined February 2011-
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Overview of Bessel functions in SciPy johndcook.com/blog/bessel_py…
Save a figure to file using plt.savefig with filename. File format is inferred from name. E.g. plt.savefig('foo.png') saves as PNG.
Scientific Python lecture notes scipy-lectures.github.io/index.html
Can use scipy.integrate.quad(f, a, b) to integrate f(x) from a to b. Limits could be infinite, e.g. quad(f, -inf, inf).
numpy.linspace(a, b, c) creates an array of c evenly spaced points starting with a and ending with b.
NumPy arrays have methods sum(), mean(), var(), and std() for simple statistics.
Matplotlib labels can take TeX strings, e.g. plt.xlabel(r'$\sqrt{x}$')
Using SymPy to find integers pairs (a, b) such that no triangle with sides a and b can have a rational third side and rational area. johndcook.com/blog/2025/09/0…
Probability distributions in SciPy johndcook.com/blog/2009/07/2…
SciPy has optimized versions of Bessel functions of order 0 and 1. For example, j0(z) & j1(z) are faster versions of jn(0, z) & jn(1,z).
Can read strings like files with StringIO docs.python.org/3/library/io.h… // very useful for testing
BLAS: Basic Linear Algebra Subprograms netlib.org/blas/
Special functions (Bessel functions, Gamma function, etc.) are located in scipy.special.
Volumetric data analysis for astronomy yt-project.org
np.isfinite() returns false if a number is inf or nan.
math.sqrt(-1) raises an exception. scipy.sqrt(-1) returns 1j.
scipy.sparse.sparsetools contains efficient low-level routines for working with sparse matrices.
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