206 lines
5.5 KiB
Python
206 lines
5.5 KiB
Python
from matplotlib.cbook import MatplotlibDeprecationWarning
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import matplotlib.pyplot as plt
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from matplotlib.scale import (
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LogTransform, InvertedLogTransform,
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SymmetricalLogTransform)
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from matplotlib.testing.decorators import check_figures_equal, image_comparison
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import numpy as np
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from numpy.testing import assert_allclose
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import io
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import pytest
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@check_figures_equal()
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def test_log_scales(fig_test, fig_ref):
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ax_test = fig_test.add_subplot(122, yscale='log', xscale='symlog')
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ax_test.axvline(24.1)
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ax_test.axhline(24.1)
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xlim = ax_test.get_xlim()
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ylim = ax_test.get_ylim()
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ax_ref = fig_ref.add_subplot(122, yscale='log', xscale='symlog')
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ax_ref.set(xlim=xlim, ylim=ylim)
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ax_ref.plot([24.1, 24.1], ylim, 'b')
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ax_ref.plot(xlim, [24.1, 24.1], 'b')
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def test_symlog_mask_nan():
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# Use a transform round-trip to verify that the forward and inverse
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# transforms work, and that they respect nans and/or masking.
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slt = SymmetricalLogTransform(10, 2, 1)
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slti = slt.inverted()
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x = np.arange(-1.5, 5, 0.5)
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out = slti.transform_non_affine(slt.transform_non_affine(x))
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assert_allclose(out, x)
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assert type(out) == type(x)
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x[4] = np.nan
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out = slti.transform_non_affine(slt.transform_non_affine(x))
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assert_allclose(out, x)
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assert type(out) == type(x)
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x = np.ma.array(x)
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out = slti.transform_non_affine(slt.transform_non_affine(x))
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assert_allclose(out, x)
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assert type(out) == type(x)
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x[3] = np.ma.masked
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out = slti.transform_non_affine(slt.transform_non_affine(x))
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assert_allclose(out, x)
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assert type(out) == type(x)
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@image_comparison(['logit_scales.png'], remove_text=True)
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def test_logit_scales():
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fig, ax = plt.subplots()
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# Typical extinction curve for logit
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x = np.array([0.001, 0.003, 0.01, 0.03, 0.1, 0.2, 0.3, 0.4, 0.5,
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0.6, 0.7, 0.8, 0.9, 0.97, 0.99, 0.997, 0.999])
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y = 1.0 / x
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ax.plot(x, y)
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ax.set_xscale('logit')
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ax.grid(True)
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bbox = ax.get_tightbbox(fig.canvas.get_renderer())
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assert np.isfinite(bbox.x0)
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assert np.isfinite(bbox.y0)
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def test_log_scatter():
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"""Issue #1799"""
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fig, ax = plt.subplots(1)
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x = np.arange(10)
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y = np.arange(10) - 1
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ax.scatter(x, y)
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buf = io.BytesIO()
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fig.savefig(buf, format='pdf')
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buf = io.BytesIO()
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fig.savefig(buf, format='eps')
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buf = io.BytesIO()
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fig.savefig(buf, format='svg')
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def test_logscale_subs():
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fig, ax = plt.subplots()
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ax.set_yscale('log', subs=np.array([2, 3, 4]))
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# force draw
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fig.canvas.draw()
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@image_comparison(['logscale_mask.png'], remove_text=True)
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def test_logscale_mask():
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# Check that zero values are masked correctly on log scales.
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# See github issue 8045
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xs = np.linspace(0, 50, 1001)
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fig, ax = plt.subplots()
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ax.plot(np.exp(-xs**2))
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fig.canvas.draw()
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ax.set(yscale="log")
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def test_extra_kwargs_raise_or_warn():
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fig, ax = plt.subplots()
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with pytest.warns(MatplotlibDeprecationWarning):
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ax.set_yscale('linear', foo='mask')
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with pytest.raises(TypeError):
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ax.set_yscale('log', foo='mask')
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with pytest.warns(MatplotlibDeprecationWarning):
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ax.set_yscale('symlog', foo='mask')
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def test_logscale_invert_transform():
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fig, ax = plt.subplots()
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ax.set_yscale('log')
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# get transformation from data to axes
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tform = (ax.transAxes + ax.transData.inverted()).inverted()
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# direct test of log transform inversion
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inverted_transform = LogTransform(base=2).inverted()
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assert isinstance(inverted_transform, InvertedLogTransform)
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assert inverted_transform.base == 2
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def test_logscale_transform_repr():
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fig, ax = plt.subplots()
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ax.set_yscale('log')
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repr(ax.transData)
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repr(LogTransform(10, nonpositive='clip'))
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@image_comparison(['logscale_nonpos_values.png'],
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remove_text=True, tol=0.02, style='mpl20')
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def test_logscale_nonpos_values():
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np.random.seed(19680801)
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xs = np.random.normal(size=int(1e3))
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fig, ((ax1, ax2), (ax3, ax4)) = plt.subplots(2, 2)
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ax1.hist(xs, range=(-5, 5), bins=10)
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ax1.set_yscale('log')
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ax2.hist(xs, range=(-5, 5), bins=10)
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ax2.set_yscale('log', nonpositive='mask')
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xdata = np.arange(0, 10, 0.01)
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ydata = np.exp(-xdata)
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edata = 0.2*(10-xdata)*np.cos(5*xdata)*np.exp(-xdata)
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ax3.fill_between(xdata, ydata - edata, ydata + edata)
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ax3.set_yscale('log')
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x = np.logspace(-1, 1)
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y = x ** 3
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yerr = x**2
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ax4.errorbar(x, y, yerr=yerr)
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ax4.set_yscale('log')
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ax4.set_xscale('log')
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def test_invalid_log_lims():
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# Check that invalid log scale limits are ignored
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fig, ax = plt.subplots()
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ax.scatter(range(0, 4), range(0, 4))
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ax.set_xscale('log')
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original_xlim = ax.get_xlim()
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with pytest.warns(UserWarning):
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ax.set_xlim(left=0)
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assert ax.get_xlim() == original_xlim
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with pytest.warns(UserWarning):
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ax.set_xlim(right=-1)
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assert ax.get_xlim() == original_xlim
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ax.set_yscale('log')
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original_ylim = ax.get_ylim()
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with pytest.warns(UserWarning):
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ax.set_ylim(bottom=0)
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assert ax.get_ylim() == original_ylim
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with pytest.warns(UserWarning):
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ax.set_ylim(top=-1)
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assert ax.get_ylim() == original_ylim
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@image_comparison(['function_scales.png'], remove_text=True, style='mpl20')
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def test_function_scale():
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def inverse(x):
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return x**2
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def forward(x):
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return x**(1/2)
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fig, ax = plt.subplots()
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x = np.arange(1, 1000)
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ax.plot(x, x)
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ax.set_xscale('function', functions=(forward, inverse))
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ax.set_xlim(1, 1000)
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