From 19fcec84d8d7d21e796c7624e521b60d28ee21ed Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:45:59 +0200 Subject: Adding upstream version 16.2.11+ds. Signed-off-by: Daniel Baumann --- .../libs/python/example/numpy/demo_gaussian.py | 37 ++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 src/boost/libs/python/example/numpy/demo_gaussian.py (limited to 'src/boost/libs/python/example/numpy/demo_gaussian.py') diff --git a/src/boost/libs/python/example/numpy/demo_gaussian.py b/src/boost/libs/python/example/numpy/demo_gaussian.py new file mode 100644 index 000000000..0b1c78995 --- /dev/null +++ b/src/boost/libs/python/example/numpy/demo_gaussian.py @@ -0,0 +1,37 @@ +# Copyright Jim Bosch 2010-2012. +# Distributed under the Boost Software License, Version 1.0. +# (See accompanying file LICENSE_1_0.txt or copy at +# http://www.boost.org/LICENSE_1_0.txt) + +import numpy +import gaussian + +mu = numpy.zeros(2, dtype=float) +sigma = numpy.identity(2, dtype=float) +sigma[0, 1] = 0.15 +sigma[1, 0] = 0.15 + +g = gaussian.bivariate_gaussian(mu, sigma) + +r = numpy.linspace(-40, 40, 1001) +x, y = numpy.meshgrid(r, r) + +z = g(x, y) + +s = z.sum() * (r[1] - r[0])**2 +print "sum (should be ~ 1):", s + +xc = (z * x).sum() / z.sum() +print "x centroid (should be ~ %f): %f" % (mu[0], xc) + +yc = (z * y).sum() / z.sum() +print "y centroid (should be ~ %f): %f" % (mu[1], yc) + +xx = (z * (x - xc)**2).sum() / z.sum() +print "xx moment (should be ~ %f): %f" % (sigma[0,0], xx) + +yy = (z * (y - yc)**2).sum() / z.sum() +print "yy moment (should be ~ %f): %f" % (sigma[1,1], yy) + +xy = 0.5 * (z * (x - xc) * (y - yc)).sum() / z.sum() +print "xy moment (should be ~ %f): %f" % (sigma[0,1], xy) -- cgit v1.2.3