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Erro = can only concatenate str (not "int") to str


Question

Estou com problema no linspace, da o seguinte erro na linha  can only concatenate str (not "int") to str

 

N_0 = input('Give initial population size N_0: ')
r   = input('Give net growth rate r: ')
dt  = input('Give time step size: ')
N_t = input('Give number of steps: ')
t = linspace(0, (N_t+1)*dt, N_t+2)
N = zeros(N_t+2)

N[0] = N_0
for n in range(N_t+1):
    N[n+1] = N[n] + r*dt*N[n]

import matplotlib.pyplot as plt
numerical_sol = 'bo' if N_t < 70 else 'b-'
plt.plot(t, N, numerical_sol, t, N_0*exp(r*t), 'r-')
plt.legend(['numerical', 'exact'], loc='upper left')
plt.xlabel('t'); plt.ylabel('N(t)')
filestem = 'growth1_%dsteps' % N_t
plt.savefig('%s.png' % filestem); plt.savefig('%s.pdf' % filestem)

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6 answers to this question

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seu erro

t = linspace(0, (N_t+1)*dt, N_t+2)

correção

t = linspace(0, (int(N_t)+1)*int(dt), int(N_t)+2)

 

comece pelo o inicio, pois seu erro é coisa que se aprende na primeira hora, deixe o matplot para depois

sugiro ir no site oficial e seguir a apresentação na documentação

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