How to fix IndexError invalid index to scalar variable

Question

This code generates error   IndexError  invalid index to scalar variable    at the line  results append RMSPE np expm1 y train testcv     y 1  for y in y test     How to fix it   import pandas as pd import numpy as np from sklearn import ensemble from sklearn import cross validation  def ToWeight y       w   np zeros y shape  dtype float      ind   y    0     w ind    1   y ind   2      return w  def RMSPE y  yhat       w   ToWeight y      rmspe   np sqrt np mean  w    y - yhat   2        return rmspe  forest   ensemble RandomForestRegressor n estimators 10  min samples split 2  n jobs -1   print   Cross validations   cv   cross validation KFold len train   n folds 5   results      for traincv  testcv in cv      y test   np expm1 forest fit X train traincv   y train traincv   predict X train testcv        results append RMSPE np expm1 y train testcv     y 1  for y in y test      testcv is    False False False       True  True  True

User · Answer

In the for  you have an iteration  then for each element of that loop which probably is a scalar  has no index  When each element is an empty array  single variable  or scalar and not a list or array you cannot use indices

User · Answer

You are trying to index into a scalar  non-iterable  value    y 1  for y in y test       this is the problem   When you call  y for y in test  you are iterating over the values already  so you get a single value in y   Your code is the same as trying to do the following   y test    1  2  3  y   y test 0    y   1 print y 0     this line will fail   I m not sure what you re trying to get into your results array  but you need to get rid of  y 1  for y in y test    If you want to append each y in y test to results  you ll need to expand your list comprehension out further to something like this    results append      y  for y in y test    Or just use a for loop   for y in y test      results append      y

User · Answer

Basically  1 is not a valid index of y  If the visitor is comming from his own code he should check if his y contains the index which he tries to access  in this case the index is 1

[python] How to fix IndexError: invalid index to scalar variable

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