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I should store binary values in an array

asked 2021-01-18 11:29:54 +0200

Rama gravatar image

updated 2021-01-18 15:46:33 +0200

slelievre gravatar image

Given a Sage integer, I wish to obtain the list of its binary digits.

How can I get that?

So far, I found the binary method of Sage integers.

Given an integer, that method returns its binary expansion as a string.

For example:

sage: a = 8
sage: a.binary()
'1000'

Thanks for the response.

Here is a follow-up question.

x = 3
z = IncreasingArrays()
z = x.binary() 

for i in range(x):
    if z[i] == 1:
        print('  ', 2^i)  # Not printing here

I want to print if binary value is 1. And raise it to power 2.

The for loop isn't printing print statement also. Please help me with these for loops and also how to store values in an array.

In C I go:

int a[6];
for(i = 2 ; i <= 5 ; i++) { a[i] = 1 ; }

Here like this in C, array values are set.

How to do the same in Sage please help.

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slelievre gravatar imageslelievre ( 2021-01-18 15:52:11 +0200 )edit

Thanks please if you understand the question please answer it.

Rama gravatar imageRama ( 2021-01-18 16:19:48 +0200 )edit

Why not open a new question:

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The new question can say "this is a follow up to Ask Sage question 55323" and you can add a comment here saying "See a follow-up question at Ask Sage question 55xxx".

slelievre gravatar imageslelievre ( 2021-01-18 17:25:27 +0200 )edit

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answered 2021-01-18 11:52:05 +0200

tmonteil gravatar image

updated 2021-01-18 12:28:57 +0200

slelievre gravatar image

I am not completely sure about your question (please provide more details if i do not understand correctly), but you can transform the string '1000' into the list of its letters as follows:

sage: list(a.binary())
['1', '0', '0', '0']

Note however that each entry is a string, not an integer. If you want a list of integers, you can transform each letter into an element of ZZ:

sage: [ZZ(i) for i in a.binary()]
[1, 0, 0, 0]

The bits and digits methods can give these bits (or "binary digits") directly as integers, ordered the other way around:

sage: a.bits()
[0, 0, 0, 1]

sage: a.digits(base=2)
[0, 0, 0, 1]
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Asked: 2021-01-18 11:29:54 +0200

Seen: 40 times

Last updated: Jan 18