Recent questions tagged math

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math - Mod function fails in python for large numbers

This python code for x in range(20, 50): print(x,math.factorial(x),math.pow(2,x), math.factorial(x) % math.pow(2,x) ) calculates ... calculates the mod function but was wondering if anyone actually knew. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Modulo operator in Objective-C returns the wrong result

I'm a little freaked out by the results I'm getting when I do modulo arithmetic in Objective-C. -1 % 3 is coming out to be -1, which isn't ... be using besides the % operator to get the correct result? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Cubic bezier curves - get Y for given X - special case where X of control points is increasing

I've read a few discussions regarding finding Y at X for a cubic Bezier curve, and have also read this article regarding the matter. My ... efficient algorithm that takes such constraints into account? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - What does the term "BODMAS" mean?

What is BODMAS and why is it useful in programming? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - How do I calculate the yaw, pitch, and roll of a point in 3D?

Given a point in 3D space, what are the three angles (e.g. Euler angles) needed to transform a line to point to that object? Imagine I have a line (or a ... angles to point to a location such as (1,2,3). See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - LCM of n numbers modulo 1000000007

I have to find LCM of n numbers MODULO 10^9+7.My approach is find LCM of two numbers and then MOD them.Then take the LCM of next element and the ... and MOD them.Do this for all elements.Is it wrong ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Wrong value for cube root in Python

Using Python 3.5 both at repl.it and the console in Windows, I get wrong answers for cube roots. When the input is (-1)**(1/3), I get the ... seems to give a complex result. Am I doing something wrong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Stuck on Project Euler #3 in python

The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ? Ok, so i am working ... function to the findPrimes function findPrimes(number_to_test , odds) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - String in scientific notation C++ to double conversion

I've got a database filled up with doubles like the following one: 1.60000000000000000000000000000000000e+01 Does anybody know how to convert a number like that to a ... << d << std::endl; } Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - JAVA elastic collision of moving and non moving circles

I'm trying to write a java mobile application (J2ME) and I got stuck with a problem: in my project there are moving circles called shots, and non moving ... (angle))*v; } thanks in advance for all helpers See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - How to create 2d plot of arbitrary, coplanar 3d curve

I have a set of points which comprise a (in theory) co-planar curve. My problem is that the plane is arbitrary and can move between each time I collect ... help on the second point as well. Thanks a ton! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - How does alpha blending work, mathematically, pixel-by-pixel?

Seems like it's not as simple as RGB1*A1 + RGB2*A2...how are values clipped? Weighted? Etc. And is this a context-dependent question? Are ... answers, but context from other environments is useful too. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Time complexity of this primality testing algorithm?

I have the following code which determines whether a number is prime: public static boolean isPrime(int n){ boolean answer = (n>1)? true: false; for(int i ... ? What is the size of the input in this case? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Finding Points On Perimeter Of a Circle

I need to draw line from the centre of a circle. For this I first chose centre of the image as a circle centre and draw a circle with known radius. ... 6 degree. Below is my image is after 120 degree. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Arithmetic Operators in Java (Beginner Question)

I know that array operators have the precedence. Then the binary arthimetic operators * , / , % . Then + and - which they are low precedence. But I ... by part. Because this always confuses me in exams. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Generating random point in a cylinder

What is best way or an algorithm for generating a random 3d point [x,y,z] inside the volume of the circular cylinder if radius r and height h of the cylinder are given? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Equation of a helix parametrized by arc length between two points in space

What is the equation of a helix parametrized by arc length (i.e. a function of arc length) between any two points in space? Is there any function ... do i implement the same using matlab or mathematica ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Does the .net framework have a build-in method to convert from degrees to radians?

I know that I can just say: radians = degrees * Math.PI/180 However I expect there to be a built in framework method, as it is such a common requirement ... me by telling me how to write my own method.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Encoding mathematical properties in RDF

I have been trying to find a solution to adding relationships, such as X has unit A < 20 into an existing ontology, but, could not find a solution ... for only few concepts in a knowledge graph - RDF See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Avoid sorting args in Python module Sympy

I am currently developing a differential operator for sympy that can be placed in matricial form. In this case the order of the args list when creating a ... took place. How to avoid args to be sorted? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - What is the error of trigonometric instructions on x86?

Where can I find the information about error ranges for trigonometric function instructions on x86 processors, like fsincos? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - How to use least squares method in Matlab?

I have 37 linear equations and 36 variables in the form of a matrix equation; A*X=B . The equations don't have an exact answer. I want to use ... am new to Matlab so any comments will help. Thank you See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - How does ‘1 * BigInt(1)’ work and how can I do the same?

I try to implement some number type and I hit the issue that mynum * 1 works, but not 1 * mynum I tried to define an implicit ... conversion not considered in this case with generic parameters?. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Convert decimal representing time to hour, minutes, seconds

I have a decimal. The range of this decimal is between 0 and 23.999999. This decimal represents a time. For example, if the decimal is 0.25, then ... do I fill in the Hours, Minutes, and Seconds values? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Difference between two large numbers C#

There are already solutions to this problem for small numbers: Here: Difference between 2 numbers Here: C# function to find the delta of two numbers ... there any way of determining the difference safely? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - PHP Round function - round up to 2 dp?

In PHP how would i round up the value 22.04496 so that it becomes 22.05? It seems that round(22.04496,2) = 22.04. Should it not be 22.05?? Thanks in advance See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Split a cubic bezier curve at multiple points

I'm writing an algorithm that will split a cubic bezier curve into multiple curves (up to 4). I have the t values for each point I want to split at ... ? Or do I need to recalculate it some other way? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Python's trigonmetric function return unexpected values

import math print "python calculator" print "calc or eval" while 0 == 0: check = raw_input() #(experimental evaluation or traditional calculator) if check ... , but I wanted to add some trig functions. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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