CODEWITHSUNDEEP
pythonnumpyarray-broadcasting
Math_Zombie
Math_Zombie

Reputation: 135

List does not have attribute reshape

In the code given below I am getting an error on the last line that list has attribute of reshape

cal should be a numpy array but cal.reshape is giving the error . Also while printing cal I am getting 13 element array but a 4 element array was expected which will be the sum of elements along the rows .

import numpy as np

A=np.array([[56.0,0.0,4.4,68.0],

[1.0,2.0,104.0,52.0,8.0],

[1.8,135.0,99.0,0.9]])

cal=A.sum(axis=0)

print(cal)

percentage=100*A/cal.reshape(1,4)

cal should be a numpy array but cal.reshape is giving the error . Also while printing cal I am getting 13 element array but a 4 element array was expected which will be the sum of elements along the rows .

Upvotes: 0

Views: 154

Answers (2)

Devesh Kumar Singh
Devesh Kumar Singh

Reputation: 20490

If you see carefully, your 2D list A has 5 elements in the second row instead of 4 like the other rows, and that causes issues with np.sum, since numpy assumes a homogeneous array where all sublists have equals rows.

So you would need to either remove an element from the 2nd list like so, (In below example I removed the first element) to make your array 3x4

import numpy as np

A=np.array([[56.0,0.0,4.4,68.0],

[2.0,104.0,52.0,8.0],

[1.8,135.0,99.0,0.9]])

cal=A.sum(axis=0)

print(cal)

percentage=100*A/cal
print(percentage)

And the output comes out as 

[[93.64548495  0.          2.83140283 88.42652796]
 [ 3.34448161 43.51464435 33.46203346 10.40312094]
 [ 3.01003344 56.48535565 63.70656371  1.17035111]]

Or you can add extra 0's in the first and third row and reshape your array to (1,5)

import numpy as np

A=np.array([[56.0,0.0,4.4,68.0, 0],

[1.0, 2.0,104.0,52.0,8.0],

[1.8,135.0,99.0,0.9, 0]])

cal=A.sum(axis=0)

print(cal)

percentage=100*A/cal
print(percentage)

The output here will be

[[ 95.23809524   0.           2.12150434  56.24483044   0.        ]
 [  1.70068027   1.45985401  50.14464802  43.01075269 100.        ]
 [  3.06122449  98.54014599  47.73384764   0.74441687   0.        ]]

Upvotes: 1

dome
dome

Reputation: 841

The problem is that the 2nd row has 5 elements instead of 4. If you correct this error your script will work.

Upvotes: 1

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