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How do I deal with large, hex numbers in Sage?

asked 2015-03-07 17:47:47 +0100

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How do I deal with large, hex numbers in Sage (say ones with 256 or 512 bytes)? How would I import them from a CSV file?

(cf. this related answer)

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answered 2015-03-07 23:13:16 +0100

tmonteil
27423 ●31 ●204 ●517 http://wiki.sagemath.o...

updated 2015-03-07 23:15:09 +0100

You can deal with .csv files by importing the csv module.

Hexadecimals are represented by numbers starting with 0x, see this page :

sage: 0x100
256
sage: 0x123
291

To transform an hexadecimal string representation s of a number to a Sage integer (that can be very long), you can do:

sage: s = '123'
sage: ZZ('0x'+s)
291

If you need more informations, you should provide a sample of your csv file and the result you would expect.

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Here's what I did, and it works very well:

import csv     mylist=[]     with open('~/Downloads/datasmall.txt', 'rb') as csvfile:          data = csv.reader(csvfile)          for row in data:              mylist.append([int(row[1]),float.fromhex(row[2])])

Geremia ( 2015-03-09 21:12:18 +0100 )edit

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Asked: 2015-03-07 17:47:47 +0100

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