Pasted

import matplotlib.pyplot as plt
import numpy as np
import random
from mpl_toolkits.mplot3d import Axes3D
 
 
def f(x, y):
    return (1 - x / 2 + x ** 5 + y ** 3) * np.exp(-x **2 - y ** 2)
 
n = 200
x = np.linspace(-3, 3, n)
y = np.linspace(-3, 3, n)
xgrid, ygrid = np.meshgrid(x, y)
z = f(xgrid, ygrid)
 
# f = plt.figure()
# axes3d = Axes3D(f)
# axes3d.plot_surface(xgrid, ygrid, z)
Axes3D(plt.figure()).plot_surface(xgrid, ygrid, z, cmap="hot", rstride=10, cstride=10)
plt.show()
help(Axes3D(plt.figure()).plot_trisurf)
 
exit()
plt.contourf(z, 12, cmap="hot")
plt.contour(z, 12, colors="black")
 
plt.show()
 
exit()
n = 20
x = np.random.random_sample(n)
print(x)
plt.figure()
random.seed(7)
# colors = [(i / len(x), i % 2, 0) for i in range(len(x))]
colors = [[random.random() for j in range(3)] for i in range(len(x))]
# plt.pie(x, colors=colors)
# plt.legend(colors)
# plt.bar(x, x)
plt.bar(range(n), x, width=1)
plt.bar(range(n), -x, width=1, color=colors)
plt.show()
help(plt.bar)
 
 
exit()
x = np.linspace(0, 2)
plt.figure()
for i in range(4):
    # plt.axes([0.25 * i, 0.25 * i, 0.25, 0.25])
    plt.axes([(i % 2) * 0.5 + 0.1, (1 - i // 2) * 0.5 + 0.1, 0.3, 0.3])
    # plt.axes([(i % 2) * 0.5, (1 - i // 2) * 0.5, 0.5, 0.5])
    y = x ** i
    plt.plot(x, y)
    plt.plot([1, 1, 0], [0, 1, 1], "--r", linewidth=3)
    plt.title("$y = x^" + str(i) + "$")
    plt.xlabel("x")
    plt.ylabel("y", verticalalignment="bottom")
    plt.ylim(0, 8)
plt.show()