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5 changed files with 2 additions and 139 deletions

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numpy==2.4.3
matplotlib==3.10.8
ipykernel==7.2.0
scipy==1.17.1
numpy
matplotlib

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# %%
import numpy as np
R = 1.0 * np.array(
[
[2, 3, 1],
[1, -2, -1],
[4, 1, -3],
]
)
L = 1.0 * np.array([8, 3, 6])

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#%%
# Python initialisieren
import numpy as np
# Parameter
G=1.*np.array([
[2,3,1,8],
[1,-2,-1,-3],
[4,1,-3,6]])
# Berechnung
m = np.max(G.shape)
n = np.linalg.norm(G)
e = np.finfo(np.float64).eps
tol = m * n * e
print(m)
print(n)
print(e)
print(tol)
# %%

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# %%
# Python initialisieren
import matplotlib.pyplot as plt
import numpy as np
import scipy.integrate as ig
# Parameter
x_0 = 0.0
x_E = np.pi
N = 11
n = 5
pr = 6
lw = 3
fig = 1
# Funktion
f = lambda x: np.sin(x)
# Berechnungen
for k in range(0, n):
x_data = np.linspace(x_0, x_E, N)
y_data = f(x_data)
I = ig.trapezoid(y=y_data, x=x_data)
J = ig.simpson(y=y_data, x=x_data)
print(f"I = {I:#.16g}")
print(f"J = {J:#.16g}")
N *= 2
# Ausgabe
print(f"I = {I:#.{pr}g}")
print(f"J = {J:#.{pr}g}")
# Plot
fh = plt.figure(fig)
plt.plot(x_data, y_data, linewidth=lw)
plt.xlabel("x")
plt.ylabel("y")
plt.grid(visible=True)
plt.axis("image")
plt.show()
# %%

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# %%
import numpy as np
import matplotlib.pyplot as plt
# %%
print(60 * "-")
print(__file__)
print("Aufgabe 2. Interpolationspolynome gemäss NEWTON-Schema berechnen")
# punkte [[x0, x1, x2, xn], [y0, y1, y2, yn]]
punkte = [
[np.array([4, 8]), np.array([1, -1])],
[np.array([-1, 1, 2]), np.array([15, 5, 9])],
[np.array([-1, 0, 1, 2]), np.array([-5, -1, -1, 1])],
]
for punkt in punkte:
# Parameter
x_data = punkt[0]
y_data = punkt[1]
x_0 = x_data[0]
x_E = x_data[-1]
N = 201
lw = 3
fig = 1
# Berechnung
n = np.size(y_data)
TAB = np.block([[y_data], [np.zeros((n - 1, n))]])
c_data = np.zeros(n)
c_data[0] = y_data[0]
for i in range(1, n):
for j in range(1, n):
TAB[i][j] = (TAB[i - 1][j] - TAB[i - 1][j - 1]) / (
x_data[j] - x_data[j - i]
)
c_data[i] = TAB[i][i]
# Funktionen:
def p(x):
d = 1
y = c_data[0]
for k in range(1, n):
d = d * (x - x_data[k - 1])
y = y + c_data[k] * d
return y
# Daten
u_data = np.linspace(x_0, x_E, N)
v_data = p(u_data)
fh = plt.figure(fig)
plt.plot(u_data, v_data, linewidth=lw)
plt.plot(x_data, y_data, "o", linewidth=lw)
plt.xlabel(r"$x$")
plt.ylabel(r"$y$")
plt.grid(visible=True)
plt.axis("image")
print(60 * "-")