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 eigenvalues and eigenvectors with linalg.eig().
1
7
4,020
Histogram bin heuristic: numpy.histogram_bin_edges(x, bins='fd') uses Freedman–Diaconis rule.
10
4,116
np.unique returns the unique elements of an array in sorted order.
1
1
16
6,447
np.linalg.pinv computes the Moore-Penrose pseudo inverse of a matrix.
15
6,057
Probability distribution parameterizations in SciPy johndcook.com/blog/2010/02/0…

Probability distribution parameterizations in SciPy

Parameterizations are the bane of statistical software. One of the most common errors is to assume that one software package uses the same parameterization as another package. For example, some...

johndcook.com
1
12
4,563
numpy.random.zipf(a, n) generates n samples from a discrete power law with exponent a.
1
10
5,449
np.nan_to_num() replaces nan with 0, inf with max float, and -inf with min float.
1
1
13
6,492
Latin hypercube: scipy.stats.qmc.LatinHypercube(d).random(n) is a solid design-of-experiments default.
12
5,091
openpyxl: a Python library to read/write Excel xlsx/xlsm files pypi.python.org/pypi/openpyx…

openpyxl

A Python library to read/write Excel 2010 xlsx/xlsm files

pypi.org
1
3
25
4,774
Lambert W poster: orcca.on.ca/LambertW/ scipy.special.lambertw
1
4
5,092
linalg.lstsq can solve over-determined linear systems. (lstsq ~ least squares)
1
9
6,506
Approximating a solution that doesn't exist johndcook.com/blog/2009/08/1…

Approximating a solution that doesn't exist | diff eqn

An example of how you can be mislead when trying to compute a solution that doesn't really exist.

johndcook.com
1
8
4,166
Interested in DSP? See SciPy's signal and ndimage subpackages.
1
7
6,447
Calling R from Python with RPy rpy.sourceforge.net/

RPy (R from Python)

Download RPy (R from Python) for free. RPy is a very simple, yet robust, Python interface to the R Programming Language. It can manage all kinds of R objects and can execute arbitrary R functions...

sourceforge.net
12
5,540
The function scipy.special.comb(n, k) returns binomial coefficients.
13
6,723
MATLAB synonymous commands in Python/NumPy mathesaurus.sourceforge.net/
9
6,622
Can solve a linear system Ax = b with linalg.solve(A, b).
15
6,673
ATLAS: Automatically Tuned Linear Algebra Software math-atlas.sourceforge.net/
1
10
6,502
astropy.constants has astronomical constants such as solar radius, the mass of Jupiter, etc. docs.astropy.org/en/latest/c…

Constants (astropy.constants)

Introduction: astropy.constants contains a number of physical constants useful in Astronomy. A Constant is a Quantity object with additional metadata describing its provenance and uncertainty. Gett...

docs.astropy.org
8
6,530
Interested in splines? See SciPy's interpolate subpackage.
6
6,354
Load more