Scientific Python@SciPyTip

Tweets about SciPy (Scientific Python) and related topics from @JohnDCook.

 Houston
JohnDCook.com
Joined February 2011
213 Photos and videos
Can compute quantiles with np.quantile. For example, np.quantile(x, [0.25, 0.5, 0.75]) yields quartiles.
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NumPy arrays have methods sum(), mean(), var(), and std() for simple statistics.
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Matplotlib labels can take TeX strings, e.g. plt.xlabel(r'$\sqrt{x}$')
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Probability distributions in SciPy johndcook.com/blog/2009/07/2…

Probability distributions in SciPy | Python

Here are some notes on how to work with probability distributions using the SciPy numerical library for Python. Functions related to probability distributions are located in scipy.stats. The general...

johndcook.com
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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).
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astropy.io.ascii provides methods for reading and writing a wide range of ASCII data table formats. docs.astropy.org/en/latest/i…
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Can read strings like files with StringIO docs.python.org/3/library/io… // very useful for testing

io — Core tools for working with streams

Source code: Lib/io.py Overview: The io module provides Python’s main facilities for dealing with various types of I/O. There are three main types of I/O: text I/O, binary I/O and raw I/O. These ar...

docs.python.org
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BLAS: Basic Linear Algebra Subprograms netlib.org/blas/
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The Blaze Ecosystem blaze.pydata.org/
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Special functions (Bessel functions, Gamma function, etc.) are located in scipy.special.
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Volumetric data analysis for astronomy yt-project.org/
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np.isfinite() returns false if a number is inf or nan.
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math.sqrt(-1) raises an exception. scipy.sqrt(-1) returns 1j.
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Log-determinant safely: sign, ld = np.linalg.slogdet(A) avoids overflow/underflow vs log(det(A)).
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scipy.sparse.sparsetools contains efficient low-level routines for working with sparse matrices.
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DataShape: a language for describing data with an emphasis on cross language support github.com/ContinuumIO/datas…

GitHub - blaze/datashape: Language defining a data description protocol

Language defining a data description protocol. Contribute to blaze/datashape development by creating an account on GitHub.

github.com
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sp.interpolate.interp1d does one-dimensional interpolation. The 'kind' option lets you specify linear, quadratic, cubic, etc.
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Understanding the FFT Algorithm jakevdp.github.io/blog/2013/…
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sympy.fibonacci(n) returns the nth Fibonacci number.
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np.isinf() test whether a number is finite.
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