What does it mean to have an index to scalar variable error python

Question

import numpy as np  with open  matrix txt    r   as f      x          for line in f          x append map int  line split     f close    a   array x   l  v   eig a   exponent   array exp l    L   identity len l    for i in xrange len l        L i  i    exponent 0  i   print L   My code opens up a text file containing a matrix  1 2 3 4 and places it in list x as integers   The list x is then converted into an array a   The eigenvalues of a are placed in l and the eigenvectors are placed in v   I then want to take the exp a  and place it in another array exponent   Then I create an identity matrix L of whatever length l is   My for loop is supposed to take the values of exponent and replace the 1 s across the diagonal of the identity matrix but I get an error saying  invalid index to scalar variable     What is wrong with my code

User · Answer

IndexError  invalid index to scalar variable happens when you try to index a numpy scalar such as numpy int64 or numpy float64  It is very similar to TypeError   int  object has no attribute    getitem    when you try to index an int    gt  gt  gt  a   np int64 5   gt  gt  gt  type a   lt type  numpy int64  gt   gt  gt  gt  a 3  Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  IndexError  invalid index to scalar variable   gt  gt  gt  a   5  gt  gt  gt  type a   lt type  int  gt   gt  gt  gt  a 3  Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  TypeError   int  object has no attribute    getitem

User · Answer

exponent is a 1D array  This means that exponent 0  is a scalar  and exponent 0  i  is trying to access it as if it were an array   Did you mean to say   L   identity len l   for i in xrange len l        L i  i    exponent i    or even  L   diag exponent

User · Answer

In my case  I was getting this error because I had an input named x and I was creating  without realizing it  a local variable called x  I thought I was trying to access an element of the input x  which was an array   while I was actually trying to access an element of the local variable x  which was a scalar

[python] What does it mean to have an index to scalar variable error? python

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