#!/usr/bin/env python


import numpy as np
from matplotlib import rcParams

import corner

rcParams["font.size"] = 16
rcParams["font.family"] = "sans-serif"
rcParams["font.sans-serif"] = ["Computer Modern Sans"]
rcParams["text.usetex"] = True
rcParams["text.latex.preamble"] = r"\usepackage{cmbright}"

np.random.seed(42)

# Set up the parameters of the problem.
ndim, nsamples = 3, 50000

# Generate some fake data.
data1 = np.random.randn(ndim * 4 * nsamples / 5).reshape([4 * nsamples / 5,
                                                          ndim])
data2 = (4 * np.random.rand(ndim)[None, :] +
         np.random.randn(ndim * nsamples / 5).reshape([nsamples / 5, ndim]))
data = np.vstack([data1, data2])

# Plot it.
figure = corner.corner(data, labels=[r"$x$", r"$y$", r"$\log \alpha$",
                                     r"$\Gamma \, [\mathrm{parsec}]$"],
                       quantiles=[0.16, 0.5, 0.84],
                       show_titles=True, title_kwargs={"fontsize": 12})
figure.gca().annotate("a demo corner plot",
                      xy=(1.0, 1.0), xycoords="figure fraction",
                      xytext=(-20, -10), textcoords="offset points",
                      ha="right", va="top")
figure.savefig("demo.png", dpi=300)