IndexError：数组的索引太多......运行此代码时出错

Question

I get the following error

IndexError: too many indices for array

when running this code:

import numpy as np
import matplotlib.pyplot as plt

y = np.array([[208500, 181500,      
               223500, 
           140000, 250000, 143000, 
           307000, 200000, 129900, 
           118000]])

X = np.array([[1710, 1262, 1786, 
           1717, 2198, 1362, 
           1694, 2090, 1774, 
           1077], 
           [2003, 1976, 2001, 
            1915, 2000, 1993, 
            2004, 1973, 1931, 
            1939]])

data=[X, y]

# print data
print(data)

input= np.array(data)
print(input)

# Setup matrices
m = np.shape(input)[0]
X=np.matrix([np.ones(m),input[:,0]]).T
y = np.matrix(input[:,1]).T

Could someone help me figure out what the issue is?

Answer 1

First, your variable named input is a 1D array. You can't use two indexes to access an 1D array. A good example is that you can't access a matrix only with one index or you can't access a vector with two indexes.

You can check the size of input if you execute input.shape

As I see, you have in the input variable a 1D array with two nested arrays. If you want to access the first array, you should execute input[0] and the append the index if the array in that position, for example input[0][0,0]

The first array is 2D shape, you can check it if you execute input[0].shape So, you should use 2 indexes to access it.

Let me know if you need further help.