2,001 questions
-2
votes
0
answers
22
views
accumulator problem to know which set contain a element? [closed]
Problem statement.
Given :
Set1 = (a * b * c * d * ……) MOD N
Set2 = (e * f * g * ….) MOD N
c, g.
We want to know from which set c and g belong, see we only have the above final value’s {
set1, set2, N,...
3
votes
2
answers
106
views
Convert floating-point value to cyclic range?
I'm not sure if I'm using the right terminology, but occasionally I find myself needing to canonicalize a floating-point value to a range in a cyclic manner. (This can be useful, for instance, for ...
- 49.8k
-3
votes
0
answers
39
views
Python Modulo operator bug [duplicate]
I'm using Python version 3.9.12. I asked Python what the remainder of -7 divided by 3 is (-7%3), and it answered 2! It should be -1, right? Am I getting it wrong? What's going on?
-5
votes
0
answers
63
views
Understanding the precedence of the modulo operator [duplicate]
I'm using Zed Shaw's "Learn Python 3 The Hard Way"; the problem exercise is on page 16, and refers to counting eggs:
print(3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6)
The author says the answer is 6....
0
votes
0
answers
89
views
The fastest MOD algorithm in C++ for extremely large uint_64_t numbers stored in an array
I am working with extremely large numbers and would like to verify my Karatsuba multiplication result ((2^136279841)-1)^2 which needs (532 344 * _m256i_epi64)^2 i.e. 4,258,752 uint64_t to store the ...
- 11
3
votes
2
answers
193
views
C++ modulo returning inconsistent results
Can someone tell me why these two functions return different results?
After running code
#include <string>
#include <stdio.h>
#include <iostream>
using namespace std;
int returnN(...
1
vote
0
answers
62
views
How to evenly divide a total value into predefined values with buffers in Python?
I've been working on a fence calculation tool that breaks down a total length, as equally as possible, into components (rails and posts) using a predefined set of rail lengths. The user can choose a ...
0
votes
0
answers
47
views
Can anyone explain why this RSA calculation not working
I made a RSA encrypting and decrypting program.
Everything works well as it is suppose to be. However when I decrypt the message, it doesn't give me the message.
Can somebody check which part is wrong ...
0
votes
0
answers
45
views
Wrapping a number within a specific range
I have come across the below wrapping formula to wrap a number x within a range [min, max].
const wrappedValue = (x - min) % (max - min + 1) + min;
I am trying to understand the formula.
Specifically,...
- 15.5k
1
vote
2
answers
89
views
Shifting a number based on the remainder of it divided by 4 - C
I have a function implemented which reverses the bits in a number. The number of bits in the number to be reversed can vary. However, of course it must be shifted to the left at the end to align with ...
- 3,925
2
votes
3
answers
128
views
How to divide the numbers between two number and see how many numbers there modulus = 0
I have a task that forbids me from using an array or String or loops only if conditions or switch cases. The task is that I need to take three numbers from the user and see the how many numbers ...
0
votes
0
answers
30
views
Problems repeating Shekhar's calculations in his article on Asymmetric and Post Quantum Cryptography
This is a great article at
https://medium.com/@shekhar.siva2609/asymmetric-encryption-and-post-quantum-cryptography-bea4a5a08ae5,
particularly if you're interested in Elliptic curve cryptography.
...
- 11
0
votes
0
answers
74
views
C++ - Questions about bit shift operators (<< and >>) [duplicate]
Consider the below code:
std::string g_CharTable = "stjkloptrew23456mncv891TZUIOPAS";
std::uint32_t value = 123456789
std::string hash;
for (std::size_t i = 0; i < 5; ++i)
{
...
- 1,933
0
votes
0
answers
29
views
How to pin modulus of the certificate public key on Android?
So I am using Android TrustKit to pin certificate's Subject Public Key Info. One of the security guys suggested I pin modulus of the public key, however, I cannot find any sort of examples on how to ...
- 6,923
0
votes
2
answers
69
views
How to convert a time string measured in 24 hours cycle to 12 hours cycle?
I have a stored value of an hour in a 24-hour format in a variable named hour. My task is to convert this value to a 12-hour format and print the result.
I tried while-loops, if-elif-statements. I ...
0
votes
1
answer
41
views
Math power function with modulo arithmetic in Python
I am learning group homomorphism (a Math concept) with modulo arithmetic. Basically, I want to show that g^(2x+8y) mod n equals to (g^(2x) . g^(8y)) mod n.
I have the following python code:
g = 57
n = ...
- 982
3
votes
2
answers
117
views
Why is `array % 1` running 150% slower for smaller numbers than larger ones?
I would understand if numpy was smart enough to see that array % 1 gives a constant result (for that dtype), and that its runtime was independent of the input. I would also understand if runtime was ...
- 5,724
0
votes
0
answers
97
views
C# modulo operation with decimal yields inconclusive result
I have a very quick question, based on the following C# code:
decimal _sampleCounter = 2100m;
decimal wrong = _sampleCounter % (30m / 2.3m);
decimal correct = 2100m % (30m / 2.3m);
Console.WriteLine(...
- 11
0
votes
2
answers
151
views
How to include a modulus operation in CasADi function
I can't find a modulus function in CasADi. I want to build a function with something like this:
from casadi import MX
angle = MX.sym('angle')
wrapped_angle = ((angle + 180) % 360) - 180
TypeError: ...
- 11.5k
1
vote
2
answers
115
views
Modulus `%%` giving unexpected result for `3.1 %% 0.1`. Is this expected?
I'm using the base modulus (%%) operator, and just struggling to understand the following behaviour. My understanding is that %% returns the remainder after dividing 2 numbers. So eg:
5 %% 2
# [1] 1
...
- 5,580
2
votes
1
answer
103
views
Generate new Column in Dataframe with Modulo of other Column
I would like to create a new column "Day2" which takes the second digit of column named "Days", so if we have Days equal to 35, we would take the number 5 to be in "Day2",...
- 739
1
vote
1
answer
121
views
Counting the number of distinct digits that divide a number- Unable to pass all test cases
I was practicing from Leetcode earlier and I came across this question:
Given an integer num, return the number of distinct digits in num that divide num.
An integer val divides nums if nums % val == ...
- 13
0
votes
0
answers
15
views
Raymarcher glitches when performing local transforms using modulus "coordinate-space" repeat trick
I am building a ray marcher in GLSL to further understand the language. I am attempting to repeat the coordinate space using modulus when calculating the SDF so that "infinite" spheres ...
0
votes
0
answers
26
views
why does the value of n increases by one in in first iteration while the result of (n+1)%26 is 0.26
in line 10, n = (n + 1) % 26; the value of n should be 0.26 in first iteration as it has not been rounded up or rounded down so why has the value of n increased by one ?? I don't understand this part ...
- 11
0
votes
1
answer
58
views
modulus maths question - competitive programming
I was attempting past competition questions and was stuck on this question. The solution was made public, but I still can't seem to get how did they derive the solution logic.
question:
Meow is ...
2
votes
3
answers
160
views
Homework Help - Using Modulo to Count out Bills and Coins
NOTE: I do NOT want the answer! I am hoping to get guidance on next steps
I am new to python and have a question about a problem I'm working:
Define a function consolidate_change that takes as ...
4
votes
3
answers
80
views
R - Addition after modulo operation
Running the snippet D=1;for (j in 1:5){D=(D-1)%%4;print(D)} I get the expected outcome:
[1] 0
[1] 3
[1] 2
[1] 1
[1] 0
But when I add 1 to the result D=1;for (j in 1:5){D=((D-1)%%4)+1;print(D)}, it ...
- 296
0
votes
1
answer
38
views
Dispatch metadata from WordPress DB query into a table with 4 columns
I have a variable (array) and is returning the following:
array(13) {
["meta_id"]=> string(1) "2"
["post_id"]=> string(4) "2112"
["...
- 1,151
3
votes
1
answer
190
views
Why don't x86-64 (or other architectures) implement division by 10?
I'm familiar with compilers replacing division and modulo by a constant (e.g. x/10) with multiplication by a magic number (x * 0xcccccccd) >> (32 + 3). Compiler example here.
movl $...
- 871
0
votes
0
answers
11
views
Best way to set desired range with inverse trig functions? [duplicate]
I am currently performing some inverse trigonometric operations. The actual formula I am using is at the bottom of this post, but is not super important. Minimally, I am taking an arctangent atan2(x,...
- 5,531
6
votes
1
answer
197
views
Why two modular operations cannot be optimized as well as one modular operation
I'm reading a C++ function that handles timestamps, and there's an expression like this:
t % (60 * 60) % 60
I thought this expression was strictly equivalent to:
t % 60
However, when I entered this ...
- 61
0
votes
0
answers
25
views
How to sort lists of matrices and find the index of a matrix on a list?
I am working with lists of 3x3 matrices with elements from the set {0,1} (modulo 2).
Problem:
As in the title I am trying to sort these lists so that I can see if another list that may contain the ...
0
votes
1
answer
88
views
Google Sheets - Why are there garbage digits in MOD(??)&"*"? [duplicate]
tl;dr - why am I getting these weird remainders in MOD()&"*", which are not showing up in MOD()?
On behalf of an old-timey cheesemonger acquaintance of mine, I'm trying to convert a ...
- 159
2
votes
2
answers
76
views
How to write c language modulo 2 with use mpfr function?
Here is the example of code in c language:
int i;
for (i=0; i < 100; i++)
{
if (i % 2 == 0)
{
// do something
}
}
But i variable is standard integer. I need this code of modulo 2 with use mpfr_t ...
-1
votes
2
answers
236
views
Python how to convert total teaspoons to tablespoons, ounces, cups, and pints using modulus and floor division
I need to take a given amount of teaspoons and convert it to statements in which the bigger units fill first and the smaller units fill second. For example,
this is what it's supposed to look like:
...
0
votes
2
answers
332
views
How to evaluate an expression in SageMath over Zmod?
I need to compute some automatically generated expressions, which may contain square roots, with the class Zmod.
For example, I want to evaluate the following expression modulo 9 (thus, using the ...
- 157
1
vote
1
answer
75
views
Alternate show of every 3 then every 1 item
My current code is like this which alternates between showing every 2 then every 1 item inside loop. I want it to show every 3 then every 1 item.
I use Adonis JS template engine (Edge)
<div class=&...
1
vote
1
answer
50
views
swap group of characters every words in list
I have a list like :
s=['eb736d0020000000073a...002300001f', '00bd860020000020efad...002300003f', '1452770020000040ef53...002300005f', 'fbeadb002000006006ac...002300007f', 'ec38b600200000801441......
0
votes
2
answers
87
views
JS Last value in array is never checked when looped
I am trying to loop through an array to check whether none of the values when compared with all of the remaining values in the array return a 0 after using the modulo operation.
In effect, this should ...
- 259
0
votes
2
answers
57
views
Save data every t time units in R
I want to do move through a loop and save a value at particular time intervals. I was thinking of something with this form:
t <- 0
t_end <- 10
time_step <- 0.01
...
- 1
0
votes
1
answer
304
views
Julia modulo of vector (or remainer of vector)
How do I obtain the modulo of a vector in Julia.
There are two ways in Julia to perform a modulo:
mod(9,5)
or equivalently:
9 % 5
However, neither works with a vector.
This also the came for ...
- 3,495
1
vote
1
answer
186
views
Can I generate x509 certificate with negative RSA key modulus?
So far I tried to generate x509 certificate in Go, using x509 library, but this doesn't succeed, since Go doesn't allow to generate negative modulus.
I tried to use openssl:
openssl req -nodes -new -...
- 264
1
vote
0
answers
20
views
Form automatic submit does not work well, because the form is sent several times
The goal I had set myself was to send the form automatically after X time had passed. The code I put down creates the send at regular intervals as if you had used the function: setInterval. I don't ...
- 11
0
votes
1
answer
238
views
How can I select every nth date in Snowflake?
Say I have a table in Snowflake with fields delivery_date, formatted as a DATETIME, and daily_volume formatted as an INT. Daily_volume follows a pattern that repeats every 10 days.
How would I query ...
- 1,592
0
votes
1
answer
77
views
How do I use the modulus operator?
When using the % operator I am left with the error "Did you forget a , here?". Is there another keyword for % in ReScript?
Js.log(20 % 2)
Note: This is a translation of this question for ...
- 29.1k
2
votes
1
answer
116
views
BigInt modulo float
I would like to calculate the a bigint modulo a number (float)
As a % b will necessarily be lower than b, the result can be expressed as a number.
example: with 10 000 000 000 000 000 004 modulo 1.43
...
- 16.9k
0
votes
3
answers
879
views
Is there a modulo operator for real variables in gnuplot?
So, gnuplot (I use 5.4 patchlevel 8) does not seem to support the modulo operator for real values:
gnuplot> a = 5.0 % 2.0
non-integer operand for %
Is there any workaround over this ...
- 977
-4
votes
1
answer
58
views
Why does this print out 21 and not 11? [duplicate]
The code I wrote was meant to take the sum of the digits of an integer number, e.g. 143 gives out 8, 020341 give out 10.
This is the code I wrote for it
I intended for this to print out 11 but it ...
- 1
0
votes
1
answer
76
views
How to properly use Modulo in Rabin Karp algorithm?
I am trying to solve leetcode problem 187. Repeated DNA Sequences using Rabin Karp algorithm with rolling hash approach. At first, I solved the problem without using any MOD operations like below.
...
- 12k
-2
votes
1
answer
51
views
Array Question for simplilearn Full stack java Program
I am trying to implement ...
When I run the application, it ...
I had expected it to return ... for the input N = ... and AR = ...
Here is the full code:
static long calculate() {
final ...
