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[Octave-bug-tracker] [bug #50808] mod(x, y) function incorrect output
From: |
anonymous |
Subject: |
[Octave-bug-tracker] [bug #50808] mod(x, y) function incorrect output |
Date: |
Sat, 15 Apr 2017 15:18:17 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0 |
URL:
<http://savannah.gnu.org/bugs/?50808>
Summary: mod(x,y) function incorrect output
Project: GNU Octave
Submitted by: None
Submitted on: Sat 15 Apr 2017 07:18:15 PM UTC
Category: Octave Function
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Incorrect Result
Status: None
Assigned to: None
Originator Name: Aaron Smith
Originator Email: address@hidden
Open/Closed: Open
Discussion Lock: Any
Release: 4.0.3
Operating System: Microsoft Windows
_______________________________________________________
Details:
I created a looping script to calculate moduli of a given number raised to a
power of 2^x, x = 1,2,3 . . . 27. The script works by squaring the result of
the previous modulus (simple number theory concept for congruences used
extensively in encryption algorithms, which is the purpose of the script).
On the third iteration of the loop, the output is off by exactly -1; the
correct answer should be 28045529. The full output is pasted below, and the
script is attached as a file. The one incorrect line throws off all of the
results that follow it.
鳴삶Enter value for a: 75634062
ans =
0: 75634062
1: 29168694
2: 120200318
3: 28045528
4: 92729807
5: 53268345
6: 6307007
7: 9600674
8: 45314227
9: 95406753
10: 37769700
11: 52886129
12: 43762381
13: 55560663
14: 132343522
15: 60348756
16: 104657036
17: 31194620
18: 126806889
19: 154670096
20: 145404120
21: 31329860
22: 154886741
23: 70915184
24: 100595978
25: 64254166
26: 114242786
27: 90586916
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Sat 15 Apr 2017 07:18:15 PM UTC Name: squaring_script.m Size: 233B
By: None
<http://savannah.gnu.org/bugs/download.php?file_id=40413>
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?50808>
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