Obrázky, grafy

import matplotlib.pyplot as plt
import numpy as np
import pandas as pd

x = np.linspace(-2,2,100)
y = x**2
z = x**3

plt.plot(x,y)
plt.plot(x,z)

[<matplotlib.lines.Line2D at 0x7efe43fba490>]

fig, ax = plt.subplots(1, figsize = (10,4))
ax.plot(x,y)
ax.plot(x,z)
ax.set(
    title="Nadpis",
    xlabel="Popisek na ose x",
    ylabel="Popisek na ose y",
    xlim = (-1,None),
    ylim = (-2,4)
)

[Text(0.5, 1.0, 'Nadpis'),
 Text(0.5, 0, 'Popisek na ose x'),
 Text(0, 0.5, 'Popisek na ose y'),
 (-1.0, 2.2),
 (-2.0, 4.0)]

plt.plot(x,y,label="parabola")
plt.plot(x,z,label="kubická parabola")
plt.legend()
plt.grid()

fig,ax = plt.subplots(2,1,sharex=True)
ax[0].plot(x,y,label="parabola")
ax[1].plot(x,z,label="kubická parabola")
for i,j in zip(ax,["kvadratické","kubické"]):
    i.legend()
    i.set(title="Graf "+j+" funkce")

fig,ax = plt.subplots(3,1,sharex=True)
for i,k in enumerate([2,4,8]):
    ax[i].plot(x,np.sin(k*x),color=f"C{i}",label=rf"$\sin({k}x)$")

plt.suptitle("Grafy některých goniometrických funkcí")    
ax[2].set(xlabel="úhel (rad)")
fig.legend()

<matplotlib.legend.Legend at 0x7efe3bc35bd0>

pocet = 100
x = np.random.random(pocet)
sum = np.random.random(pocet)
y = np.exp(3*x)*(1+0.4*sum)
fig, ax = plt.subplots(1)
plt.plot(x,y,".")
#ax.set(yscale="log")

[<matplotlib.lines.Line2D at 0x7efe3ba19f90>]

x = np.linspace(0,1,100)
y = x**2
fig,ax = plt.subplots(1)
ax.plot(x,y)
# ax.set(
#     xlim=(None,None),
#     ylim=(-1,None),
#     title="Můj graf",
#     xlabel="osa x",
#     ylabel="osa y",
# )
# plt.grid()

[<matplotlib.lines.Line2D at 0x7efe3ba53d90>]

x = np.linspace(0,1,100)
df = pd.DataFrame(index=x)
df["y1"] = x**2
df["y2"] = x**2+.5
fig,ax = plt.subplots(1)
df.plot(ax=ax)
# ax.set(
#     xlim=(None,None),
#     ylim=(-1,None),
#     title="Můj graf",
#     xlabel="osa x",
#     ylabel="osa y",
# )
# plt.grid()

<Axes: >