[FIXED] too many indices when debugging in Spyder

Issue

I have an array "voltage", See the image.

I want to find the maximum of the voltage.

vmax = max(voltage[:,1].tolist())

However I got the error when debugging in Spyder console:

-> vmax = max(voltage[:,1].tolist()) (Pdb) next

IndexError: 'too many indices'

So questions:

1. What is wrong? I tried to convert the second column of the array to a list, then take the maximum value.
2. How to check the value of vmax? I haven't seen it in the variable explorer. I just typed the command print(vmax) in the console.

EDIT:

voltage is an array by the image below.

Solution

Thanks mdurant and WarrenWeckesser. They already answered in the comments.

vmax = voltage.max()

Answered By - user1108948