CODEWITHSUNDEEP
pythonmatplotlib
user405381
user405381

Reputation: 37

Graph doesn't show when axes are scaled

I would like to make a plot with three different graphs in it. This is my code:

import numpy as np
from math import sqrt
import matplotlib.pyplot as plt

def make_sequence(N:int, alpha:float, beta:float) -> np.ndarray:
    z_n = np.empty((N, 1))
    for n in range(1, N+1):
        z_n[n-1] = alpha*(1+sqrt(3))**n + beta*(1-sqrt(3))**n
    return z_n

x0 = make_sequence(50, 0.0, 1.0)
x1 = make_sequence(50, 0.0, 99.0)
x2 = make_sequence(50, 5.0, 5.0)

plt.plot(x0, 'bo')
plt.plot(x1, 'ro')
plt.plot(x2, 'go')
plt.axis([0, 50, -2, 2])
plt.title(r'$z_1,...,z_{50}$')
plt.xlabel('n')
plt.legend([r'$\alpha =0$,  $\beta =1$', r'$\alpha =0$,  $\beta =99$', r'$\alpha =5$,  $\beta =5$'])
plt.show()

Why does x2 not show up on the plot?
If I try to plot x2 alone it only shows if I remove the axis-scaling command.

Upvotes: 1

Views: 27

Answers (1)

ImportanceOfBeingErnest
ImportanceOfBeingErnest

Reputation: 339705

Printing min(x2) and max(x2) shows that x2 ranges from 10 to ~3.3e22. However, your y axis only goes from -2 to 2. Hence none of the values from x2 are in the visible range.

You may of course change the scale to plt.axis([0, 50, -2, 3.5e22]), which would result in

enter image description here

But then, x0 and x1 are not well seen in the plot anymore. You need to decide for yourself, if it makes sense to plot all 3 series in the same plot.

Upvotes: 1

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