[examples] use np.radians/np.degrees where appropriate

Author: twmr

examples/animation/double_pendulum_animated.py

@@ -1,7 +1,7 @@
 # Double pendulum formula translated from the C code at
 # http://www.physics.usyd.edu.au/~wheat/dpend_html/solve_dpend.c
 
-from numpy import sin, cos, pi, array
+from numpy import sin, cos
 import numpy as np
 import matplotlib.pyplot as plt
 import scipy.integrate as integrate

examples/api/custom_projection_example.py

@@ -271,8 +271,8 @@ def format_coord(self, lon, lat):
 
         In this case, we want them to be displayed in degrees N/S/E/W.
         """
-        lon = lon * (180.0 / np.pi)
-        lat = lat * (180.0 / np.pi)
+        lon = np.degrees(lon)
+        lat = np.degrees(lat)
         if lat >= 0.0:
             ns = 'N'
         else:
@@ -294,8 +294,7 @@ def __init__(self, round_to=1.0):
             self._round_to = round_to
 
         def __call__(self, x, pos=None):
-            degrees = (x / np.pi) * 180.0
-            degrees = round(degrees / self._round_to) * self._round_to
+            degrees = round(np.degrees(x) / self._round_to) * self._round_to
             # \u00b0 : degree symbol
             return "%d\u00b0" % degrees
 
@@ -347,7 +346,7 @@ def set_longitude_grid_ends(self, degrees):
         class -- it provides an interface to something that has no
         analogy in the base Axes class.
         """
-        longitude_cap = degrees * (np.pi / 180.0)
+        longitude_cap = np.radians(degrees)
         # Change the xaxis gridlines transform so that it draws from
         # -degrees to degrees, rather than -pi to pi.
         self._xaxis_pretransform \

examples/api/custom_scale_example.py

@@ -41,7 +41,7 @@ def __init__(self, axis, **kwargs):
         thresh: The degree above which to crop the data.
         """
         mscale.ScaleBase.__init__(self)
-        thresh = kwargs.pop("thresh", (85 / 180.0) * np.pi)
+        thresh = kwargs.pop("thresh", np.radians(85))
         if thresh >= np.pi / 2.0:
             raise ValueError("thresh must be less than pi/2")
         self.thresh = thresh
@@ -72,11 +72,10 @@ def set_default_locators_and_formatters(self, axis):
         class DegreeFormatter(Formatter):
             def __call__(self, x, pos=None):
                 # \u00b0 : degree symbol
-                return "%d\u00b0" % ((x / np.pi) * 180.0)
+                return "%d\u00b0" % (np.degrees(x))
 
-        deg2rad = np.pi / 180.0
         axis.set_major_locator(FixedLocator(
-            np.arange(-90, 90, 10) * deg2rad))
+            np.radians(np.arange(-90, 90, 10))))
         axis.set_major_formatter(DegreeFormatter())
         axis.set_minor_formatter(DegreeFormatter())
 
@@ -159,7 +158,7 @@ def inverted(self):
     import matplotlib.pyplot as plt
 
     t = np.arange(-180.0, 180.0, 0.1)
-    s = t / 360.0 * np.pi
+    s = np.radius(t)/2.
 
     plt.plot(t, s, '-', lw=2)
     plt.gca().set_yscale('mercator')

examples/api/joinstyle.py

@@ -8,7 +8,7 @@
 
 
 def plot_angle(ax, x, y, angle, style):
-    phi = angle/180*np.pi
+    phi = np.radians(angle)
     xx = [x + .5, x, x + .5*np.cos(phi)]
     yy = [y, y, y + .5*np.sin(phi)]
     ax.plot(xx, yy, lw=8, color='blue', solid_joinstyle=style)

examples/api/radar_chart.py

@@ -76,7 +76,7 @@ def _close_line(self, line):
                 line.set_data(x, y)
 
         def set_varlabels(self, labels):
-            self.set_thetagrids(theta*180/np.pi, labels)
+            self.set_thetagrids(np.degrees(theta), labels)
 
         def _gen_axes_patch(self):
             return self.draw_patch()

examples/api/sankey_demo_old.py

@@ -44,7 +44,7 @@ def sankey(ax,
 
     def add_output(path, loss, sign=1):
         # Arrow tip height
-        h = (loss/2 + w) * np.tan(outangle/180.*np.pi)
+        h = (loss/2 + w) * np.tan(np.radians(outangle))
         move, (x, y) = path[-1]  # Use last point as reference
         if sign == 0:  # Final loss (horizontal)
             path.extend([(Path.LINETO, [x + dx, y]),
@@ -68,7 +68,7 @@ def add_output(path, loss, sign=1):
             outtips.append((sign, path[-5][1]))
 
     def add_input(path, gain, sign=1):
-        h = (gain / 2) * np.tan(inangle / 180. * np.pi)  # Dip depth
+        h = (gain / 2) * np.tan(np.radians(inangle))  # Dip depth
         move, (x, y) = path[-1]  # Use last point as reference
         if sign == 0:  # First gain (horizontal)
             path.extend([(Path.LINETO, [x - dx, y]),

examples/pylab_examples/tricontour_demo.py

@@ -65,8 +65,8 @@
     [-0.057, 0.881], [-0.062, 0.876], [-0.078, 0.876], [-0.087, 0.872],
     [-0.030, 0.907], [-0.007, 0.905], [-0.057, 0.916], [-0.025, 0.933],
     [-0.077, 0.990], [-0.059, 0.993]])
-x = xy[:, 0]*180/3.14159
-y = xy[:, 1]*180/3.14159
+x = np.degrees(xy[:, 0])
+y = np.degrees(xy[:, 1])
 x0 = -5
 y0 = 52
 z = np.exp(-0.01*((x - x0)*(x - x0) + (y - y0)*(y - y0)))

examples/pylab_examples/triplot_demo.py

@@ -63,8 +63,8 @@
     [-0.057, 0.881], [-0.062, 0.876], [-0.078, 0.876], [-0.087, 0.872],
     [-0.030, 0.907], [-0.007, 0.905], [-0.057, 0.916], [-0.025, 0.933],
     [-0.077, 0.990], [-0.059, 0.993]])
-x = xy[:, 0]*180/3.14159
-y = xy[:, 1]*180/3.14159
+x = np.degrees(xy[:, 0])
+y = np.degrees(xy[:, 1])
 
 triangles = np.asarray([
     [67, 66,  1], [65,  2, 66], [ 1, 66,  2], [64,  2, 65], [63,  3, 64],

examples/units/ellipse_with_units.py

@@ -16,7 +16,7 @@
 x = 0.5 * width * np.cos(theta)
 y = 0.5 * height * np.sin(theta)
 
-rtheta = angle*np.pi/180.
+rtheta = np.radians(angle)
 R = np.array([
     [np.cos(rtheta), -np.sin(rtheta)],
     [np.sin(rtheta),  np.cos(rtheta)],