65 lines
1.3 KiB
Python
65 lines
1.3 KiB
Python
# -*- coding: utf-8 -*-
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import numpy as np
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import matplotlib.pyplot as plt
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# functii
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x = np.linspace(-3, 5,400)
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y = x**2
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x_int = np.array([-1.0,3])
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y_int = x_int**2
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plt.plot(x, y, label="$y=x^2$")
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plt.plot(x, 2*x+3, label="y=2x+3")
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plt.scatter(x_int,y_int, s = 60, label="intersecție")
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plt.title("Graficul funcției $f(x)=x^2$")
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plt.xlabel("x")
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plt.ylabel("y")
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plt.grid(True)
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plt.axhline(0, color="black", linewidth=0.8)
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plt.axvline(0, color="black", linewidth=0.8)
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plt.legend()
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plt.figure(figsize=(7.2,4.8))
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plt.show()
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# sin cos
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rad = np.linspace(-2*np.pi, 2*np.pi, 100)
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sinus = np.sin(rad)
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cosin = np.cos(rad)
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plt.title("Graficele funcțiilor sin(x) și cos(x)")
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plt.xlabel("x")
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plt.ylabel("y")
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plt.grid(True)
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plt.axhline(0, color="black", linewidth=0.9)
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plt.axhline(1, color="red")
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plt.axhline(-1, color="red")
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plt.axvline(0, color="black", linewidth=0.5)
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plt.plot(rad, sinus, label="$sin(x)$")
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plt.plot(rad, cosin, label="$cos(x)$")
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plt.legend()
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plt.show()
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# suprafete plane
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x = np.linspace(-2, 2, 100)
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y = np.linspace(-2, 2, 100)
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X, Y = np.meshgrid(x,y)
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Z = X**2 + Y**2
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fig = plt.figure()
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ax = fig.add_subplot(111, projection="3d")
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ax.plot_surface(X,Y,Z, alpha=0.85)
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ax.set_title("$f(x,y) = x^2 + y^2$")
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ax.set_xlabel("$x$")
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ax.set_ylabel("$y$")
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ax.set_zlabel("$z$")
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plt.show()
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