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author | Arun Isaac | 2021-03-26 14:43:07 +0530 |
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committer | Arun Isaac | 2021-03-26 14:48:48 +0530 |
commit | b6e2f7875029d1a5a0f6f7a5761b5f3af1f7b448 (patch) | |
tree | f9a470f6e947a0cfc1bec1b542318bd8b66a857b /src | |
parent | 05f6d0e94e5603caa769137508cf005bea3c9adc (diff) | |
download | sambal-b6e2f7875029d1a5a0f6f7a5761b5f3af1f7b448.tar.gz sambal-b6e2f7875029d1a5a0f6f7a5761b5f3af1f7b448.tar.lz sambal-b6e2f7875029d1a5a0f6f7a5761b5f3af1f7b448.zip |
Simplify directory structure.
* setup.cfg: Specify the sambal package explicitly.
* src/sambal: Move to sambal.
Diffstat (limited to 'src')
-rw-r--r-- | src/sambal/__init__.py | 0 | ||||
-rw-r--r-- | src/sambal/sambal.py | 65 |
2 files changed, 0 insertions, 65 deletions
diff --git a/src/sambal/__init__.py b/src/sambal/__init__.py deleted file mode 100644 index e69de29..0000000 --- a/src/sambal/__init__.py +++ /dev/null diff --git a/src/sambal/sambal.py b/src/sambal/sambal.py deleted file mode 100644 index c42ea44..0000000 --- a/src/sambal/sambal.py +++ /dev/null @@ -1,65 +0,0 @@ -# sambal --- Sample balls, spheres, spherical caps -# Copyright © 2021 Arun I <arunisaac@systemreboot.net> -# Copyright © 2021 Murugesan Venkatapathi <murugesh@iisc.ac.in> -# -# This program is free software: you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation, either version 3 of the License, or -# (at your option) any later version. -# -# This program is distributed in the hope that it will be useful, but -# WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -# General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with this program. If not, see -# <https://www.gnu.org/licenses/>. - -from numpy import cos, dot, empty, log, sin, sqrt, pi -from numpy.random import randn, random -from numpy.linalg import norm - -def random_on_sphere(dim): - """Return a random vector uniformly distributed on the unit sphere.""" - x = randn(dim) - return x / norm(x) - -def rotate_from_nth_canonical(x, axis): - """Rotate vector from around the nth canonical axis to the given axis. - """ - xn = x[-1] - axisn = axis[-1] - if axisn != 1: - b = norm(axis[:-1]) - a = (dot(x, axis) - xn*axisn) / b - s = sqrt(1 - axisn**2) - x = x + (xn*s + a*(axisn - 1))/b * axis - x[-1] = x[-1] + xn*(axisn - 1) - a*s \ - - axisn*(xn*s + a*(axisn - 1))/b - return x - -def random_on_disk(axis, planar_angle): - """Return a random vector uniformly distributed on the periphery of a -disk.""" - dim = axis.size - x = empty(dim) - x[:-1] = sin(planar_angle) * random_on_sphere(dim - 1) - x[-1] = cos(planar_angle) - return rotate_from_nth_canonical(x, axis) - -def random_on_cap(axis, maximum_planar_angle): - """Return a random vector uniformly distributed on a spherical -cap. The random planar angle is generated using rejection sampling. - - """ - # We apply the log function just to prevent the floats from - # underflowing. - dim = axis.size - box_height = (dim-2)*log(sin(min(maximum_planar_angle, pi/2))) - while True: - theta = maximum_planar_angle*random() - f = box_height + log(random()) - if f < (dim-2)*log(sin(theta)): - break - return random_on_disk(axis, theta) |