np.unique returns the unique elements of an array in sorted order.

np.linalg.pinv computes the Moore-Penrose pseudo inverse of a matrix.

Probability distribution parameterizations in SciPy johndcook.com/blog/2010/02/0…

numpy.random.zipf(a, n) generates n samples from a discrete power law with exponent a.

np.nan_to_num() replaces nan with 0, inf with max float, and -inf with min float.

Latin hypercube: scipy.stats.qmc.LatinHypercube(d).random(n) is a solid design-of-experiments default.

openpyxl: a Python library to read/write Excel xlsx/xlsm files pypi.python.org/pypi/openpyx…

Lambert W poster: orcca.on.ca/LambertW/ scipy.special.lambertw

linalg.lstsq can solve over-determined linear systems. (lstsq ~ least squares)

Approximating a solution that doesn't exist johndcook.com/blog/2009/08/1…

Interested in DSP? See SciPy's signal and ndimage subpackages.

Calling R from Python with RPy rpy.sourceforge.net/

The function scipy.special.comb(n, k) returns binomial coefficients.

MATLAB synonymous commands in Python/NumPy mathesaurus.sourceforge.net/

Can solve a linear system Ax = b with linalg.solve(A, b).

ATLAS: Automatically Tuned Linear Algebra Software math-atlas.sourceforge.net/

astropy.constants has astronomical constants such as solar radius, the mass of Jupiter, etc. docs.astropy.org/en/latest/c…

Interested in splines? See SciPy's interpolate subpackage.

scikit-learn scikit-learn.org

Gamma and related functions in SciPy johndcook.com/blog/gamma_pyt…