In [1]:

    

%matplotlib notebook
import numpy as np
import matplotlib.pyplot as plt


    

In [ ]:

    

# %load exercises/3.1-colors.py
t = np.arange(0.0, 5.0, 0.2)
plt.plot(t, t, , t, t**2, , t, t**3, )
plt.show()


    

In [3]:

    

xs, ys = np.mgrid[:4, 9:0:-1]
markers = [".", "+", ",", "x", "o", "D", "d", "", "8", "s", "p", "*", "|", "_", "h", "H", 0, 4, "<", "3",
           1, 5, ">", "4", 2, 6, "^", "2", 3, 7, "v", "1", "None", None, " ", ""]
descripts = ["point", "plus", "pixel", "cross", "circle", "diamond", "thin diamond", "",
             "octagon", "square", "pentagon", "star", "vertical bar", "horizontal bar", "hexagon 1", "hexagon 2",
             "tick left", "caret left", "triangle left", "tri left", "tick right", "caret right", "triangle right", "tri right",
             "tick up", "caret up", "triangle up", "tri up", "tick down", "caret down", "triangle down", "tri down",
             "Nothing", "Nothing", "Nothing", "Nothing"]
fig, ax = plt.subplots(1, 1, figsize=(14, 4))
for x, y, m, d in zip(xs.T.flat, ys.T.flat, markers, descripts):
    ax.scatter(x, y, marker=m, s=100)
    ax.text(x + 0.1, y - 0.1, d, size=14)
ax.set_axis_off()
plt.show()


    

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# %load exercises/3.2-markers.py
t = np.arange(0.0, 5.0, 0.2)
plt.plot(t, t, , t, t**2, , t, t**3, )
plt.show()


    

In [5]:

    

fig = plt.figure()
t = np.arange(0.0, 5.0, 0.2)
plt.plot(t, t, '-', t, t**2, '--', t, t**3, '-.', t, -t, ':')
plt.show()


    

In [6]:

    

fig, ax = plt.subplots(1, 1)
ax.bar([1, 2, 3, 4], [10, 20, 15, 13], ls='dashed', ec='r', lw=5)
plt.show()


    

In [7]:

    

fig = plt.figure()

t = np.arange(0., 5., 0.2)
# red dashes, blue squares and green triangles
plt.plot(t, t, 'r--', t, t**2, 'bs', t, t**3, 'g^')
plt.show()


    

In [ ]:

    

# %load exercises/3.3-properties.py
t = np.arange(0.0, 5.0, 0.1)
a = np.exp(-t) * np.cos(2*np.pi*t)
plt.plot(t, a, )
plt.show()


    

In [ ]:

    

# %load http://matplotlib.org/mpl_examples/color/colormaps_reference.py  # For those with v1.2 or higher
"""
Reference for colormaps included with Matplotlib.

This reference example shows all colormaps included with Matplotlib. Note that
any colormap listed here can be reversed by appending "_r" (e.g., "pink_r").
These colormaps are divided into the following categories:

Sequential:
    These colormaps are approximately monochromatic colormaps varying smoothly
    between two color tones---usually from low saturation (e.g. white) to high
    saturation (e.g. a bright blue). Sequential colormaps are ideal for
    representing most scientific data since they show a clear progression from
    low-to-high values.

Diverging:
    These colormaps have a median value (usually light in color) and vary
    smoothly to two different color tones at high and low values. Diverging
    colormaps are ideal when your data has a median value that is significant
    (e.g.  0, such that positive and negative values are represented by
    different colors of the colormap).

Qualitative:
    These colormaps vary rapidly in color. Qualitative colormaps are useful for
    choosing a set of discrete colors. For example::

        color_list = plt.cm.Set3(np.linspace(0, 1, 12))

    gives a list of RGB colors that are good for plotting a series of lines on
    a dark background.

Miscellaneous:
    Colormaps that don't fit into the categories above.

"""
import numpy as np
import matplotlib.pyplot as plt

# Have colormaps separated into categories:
# http://matplotlib.org/examples/color/colormaps_reference.html

cmaps = [('Perceptually Uniform Sequential',
                            ['viridis', 'inferno', 'plasma', 'magma']),
         ('Sequential',     ['Blues', 'BuGn', 'BuPu',
                             'GnBu', 'Greens', 'Greys', 'Oranges', 'OrRd',
                             'PuBu', 'PuBuGn', 'PuRd', 'Purples', 'RdPu',
                             'Reds', 'YlGn', 'YlGnBu', 'YlOrBr', 'YlOrRd']),
         ('Sequential (2)', ['afmhot', 'autumn', 'bone', 'cool',
                             'copper', 'gist_heat', 'gray', 'hot',
                             'pink', 'spring', 'summer', 'winter']),
         ('Diverging',      ['BrBG', 'bwr', 'coolwarm', 'PiYG', 'PRGn', 'PuOr',
                             'RdBu', 'RdGy', 'RdYlBu', 'RdYlGn', 'Spectral',
                             'seismic']),
         ('Qualitative',    ['Accent', 'Dark2', 'Paired', 'Pastel1',
                             'Pastel2', 'Set1', 'Set2', 'Set3']),
         ('Miscellaneous',  ['gist_earth', 'terrain', 'ocean', 'gist_stern',
                             'brg', 'CMRmap', 'cubehelix',
                             'gnuplot', 'gnuplot2', 'gist_ncar',
                             'nipy_spectral', 'jet', 'rainbow',
                             'gist_rainbow', 'hsv', 'flag', 'prism'])]


nrows = max(len(cmap_list) for cmap_category, cmap_list in cmaps)
gradient = np.linspace(0, 1, 256)
gradient = np.vstack((gradient, gradient))


def plot_color_gradients(cmap_category, cmap_list):
    fig, axes = plt.subplots(nrows=nrows)
    fig.subplots_adjust(top=0.95, bottom=0.01, left=0.2, right=0.99)
    axes[0].set_title(cmap_category + ' colormaps', fontsize=14)

    for ax, name in zip(axes, cmap_list):
        ax.imshow(gradient, aspect='auto', cmap=plt.get_cmap(name))
        pos = list(ax.get_position().bounds)
        x_text = pos[0] - 0.01
        y_text = pos[1] + pos[3]/2.
        fig.text(x_text, y_text, name, va='center', ha='right', fontsize=10)

    # Turn off *all* ticks & spines, not just the ones with colormaps.
    for ax in axes:
        ax.set_axis_off()

for cmap_category, cmap_list in cmaps:
    plot_color_gradients(cmap_category, cmap_list)

plt.show()


    

In [10]:

    

fig, (ax1, ax2) = plt.subplots(1, 2)
z = np.random.random((10, 10))
ax1.imshow(z, interpolation='none', cmap='gray')
ax2.imshow(z, interpolation='none', cmap='coolwarm')
plt.show()


    

In [11]:

    

fig = plt.figure()

plt.scatter([1, 2, 3, 4], [4, 3, 2, 1])
plt.title(r'$\sigma_{i=15}$', fontsize=20)
plt.show()


    

In [12]:

    

fig = plt.figure()

t = np.arange(0.0, 5.0, 0.01)
s = np.cos(2*np.pi*t)
plt.plot(t, s, lw=2)

plt.annotate('local max', xy=(2, 1), xytext=(4, 1.5),
             arrowprops=dict(facecolor='black', shrink=0.0))

plt.ylim(-2, 2)
plt.show()


    

In [13]:

    

import matplotlib.patches as mpatches

styles = mpatches.ArrowStyle.get_styles()

ncol = 2
nrow = (len(styles)+1) // ncol
figheight = (nrow+0.5)
fig = plt.figure(figsize=(4.0*ncol/0.85, figheight/0.85))
fontsize = 0.4 * 70

ax = fig.add_axes([0, 0, 1, 1])
ax.set_xlim(0, 4*ncol)
ax.set_ylim(0, figheight)

def to_texstring(s):
    s = s.replace("<", r"$<$")
    s = s.replace(">", r"$>$")
    s = s.replace("|", r"$|$")
    return s

for i, (stylename, styleclass) in enumerate(sorted(styles.items())):
    x = 3.2 + (i//nrow)*4
    y = (figheight - 0.7 - i%nrow)
    p = mpatches.Circle((x, y), 0.2, fc="w")
    ax.add_patch(p)

    ax.annotate(to_texstring(stylename), (x, y),
                (x-1.2, y),
                ha="right", va="center",
                size=fontsize,
                arrowprops=dict(arrowstyle=stylename,
                                patchB=p,
                                shrinkA=50,
                                shrinkB=5,
                                fc="w", ec="k",
                                connectionstyle="arc3,rad=-0.25",
                                ),
                bbox=dict(boxstyle="square", fc="w"))

ax.set_axis_off()
plt.show()


    

In [ ]:

    

# %load exercises/3.4-arrows.py
t = np.arange(0.0, 5.0, 0.01)
s = np.cos(2*np.pi*t)
plt.plot(t, s, lw=2)

plt.annotate('local max', xy=(2, 1), xytext=(3, 1.5),
             arrowprops=dict())

plt.ylim(-2, 2)
plt.show()


    

In [15]:

    

fig = plt.figure()

bars = plt.bar([1, 2, 3, 4], [10, 12, 15, 17])
plt.setp(bars[0], hatch='x', facecolor='w')
plt.setp(bars[1], hatch='xx-', facecolor='orange')
plt.setp(bars[2], hatch='+O.', facecolor='c')
plt.setp(bars[3], hatch='*', facecolor='y')
plt.show()