> On Apr 29, 2016, at 1:15 PM, Colin Ross <colin.ross....@gmail.com> wrote:
>
> Hello,
>
> I have an array that takes on the following form:
>
> x = [1000,1001,1011,1111]
>
> The array elements are meant to be binary representation of integers.
>
> Goal: Access array elements and extract the first two bits.
>
> e.g. Final result would look something like this:
>
> x_new = [10,10,10,11]
>
> What I have tried:
>
> data_indices = range(4) # Set up array of values to loop over
>
> for idx in data_indices:
> f = x[idx] # Index into array of x values
Instead of looping over a range of indices, you should loop over the data
itself.
for number in x:
s = bin(number)
print s
> f_idx = f[:2] # Extract first two elements
You couldn't slice an integer. First convert to the binary representation in
string form. You can strip off the prefix if you just want the digits.
s = bin(number).lstrip('0b')
Then you can slice off the first two digits if you want. Remember, it's a str
of digits, not a number.
> print f_idx
>
> I then receive the following error:
>
> IndexError: invalid index to scalar variable.
>
> Any help with accomplishing my outline dgoal would be greatly appreciated.
>
> Thank you.
>
> Colin
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