def graficocont(f, a, b, grau):
grau += 1
g = []
for i in range(grau):
g.append(x**i)
B = np.zeros((grau,grau))
D = np.zeros((grau,1))
for i in range(grau):
for j in range(grau):
B[i][j] = integrate(g[i]*g[j], (x, a, b))
D[i][0] = integrate(g[i]*f, (x, a, b))
Y = sistLinear(B, D, grau)
P = 0
for i in range(grau):
P += Y[i][0]*x**i
fig, ax = plt.subplots()
z = np.arange(0,4,0.001)
y = []
for i in range(len(z)):
y.append(P.subs(x,z[i]))
b = np.arange(0,4,0.001)
w = []
for i in range(len(b)):
w.append(f.subs(x,b[i]))
ax.plot(b,w, label="Função f(x)")
ax.plot(z,y, label='Função g(x)')
ax.legend()
ax.grid()
plt.show()
def graficodis(pontos,grau):
pts = len(pontos)
g = np.zeros((grau+1,pts))
f = []
for j in range(pts):
for i in range(grau+1):
g[i][j] = pontos[j][0]**i
f.append(pontos[j][1])
B = np.zeros((grau+1,grau+1))
for i in range(grau+1):
for j in range(grau+1):
soma = 0
for k in range(pts):
soma += g[i][k] * g[j][k]
B[i][j] = soma
D = []
for i in range(grau+1):
soma = 0
for k in range(pts):
soma += g[i][k] * f[k]
D.append([soma])
D = np.asarray(D)
Y = sistLinear(B,D,grau+1)
P = 0
for i in range(grau+1):
P += Y[i][0]*x**i
fig, ax = plt.subplots()
z = np.arange(-4,4,0.001)
y = []
for i in range(len(z)):
y.append(P.subs(x,z[i]))
b = []
w = []
for i in range(len(pontos)):
b.append(pontos[i][0])
w.append(pontos[i][1])
ax.plot(b,w, "r*", markersize=6, label="Pontos da tabela")
ax.plot(z,y, label='Função g(x)')
ax.legend()
ax.grid()
plt.show()
