Recent questions tagged math

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math - extract rotation, scale values from 2d transformation matrix

how can i extract rotation, scale and translation values from 2d transformation matrix? i mean a have a 2d ... 65.56274134518259 (in degrees) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - An inverse Fibonacci algorithm?

There are dozens of ways of computing F(n) for an arbitrary n, many of which have great runtime and memory usage ... numbers using O(1) space. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - 3D coordinates on a sphere to Latitude and Longitude

I've got the following information: There exists a sphere with origin (0,0,0) and radius R. After doing a ray- ... me the most to accept :P. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Cracking short RSA keys

Given the following RSA keys, how does one go about determining what the values of p and q are? ... Key: (10142789312725007, 8114231289041741) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Too many 'if' statements?

The following code does work how I need it to, but it's ugly, excessive or a number of other things. I've ... result = 3; } return result; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Inaccurate Logarithm in Python

I work daily with Python 2.4 at my company. I used the versatile logarithm function 'log' from the ... in mathematical functions in Python? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - pow (x,y) in Java

What's the difference between: Math.pow ( x,y ); // x^y To: x^y; // x^y ? Will I prefer to use x ... have to use always with Math.pow() method? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Process mathematical equations in php

A user is allowed to enter any mathematical equation they like (with one variable): x + 5 1 - x/2 (x ... very hardcore filter on user input. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - What is the C++ function to raise a number to a power?

How do I raise a number to a power? 2^1 2^2 2^3 etc... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - how map 2d grid points (x,y) onto sphere as 3d points (x,y,z)

I have a set of 2d grid points (x,y) that I want to map/project onto a sphere as 3d points (x, ... trouble finding the right equations for that. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Java check if two rectangles overlap at any point

I have multiple rectangles and one special rectangle: the selection rect. I want to check for each rectangle if the ... is an image for clarity: See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Equivalent of `polyfit` for a 2D polynomial in Python

I'd like to find a least-squares solution for the a coefficients in z = (a0 + a1*x + a2*y + a3*x* ... , but the solution is provided via MATLAB. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - In Java how do you convert a decimal number to base 36?

If I have a decimal number, how do I convert it to base 36 in Java? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - How can I calculate divide and modulo for integers in C#?

How can I calculate division and modulo for integer numbers in C#? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Calculating point on a circle's circumference from angle in C#?

I imagine that this is a simple question, but I'm getting some strange results with my current code and I ... prove helpful to someone else. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Shortest distance between points algorithm

Given a set of points on a plane, find the shortest line segment formed by any two of these points. How ... I need another algorithm to compare. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Mixing two colors "naturally" in javascript

The problem: I want to mix two colors in javascript, and get the result color. There are a lot of ... generate something similar to green :) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Calculating bounding box a certain distance away from a lat/long coordinate in Java

Given a coordinate (lat, long), I am trying to calculate a square bounding box that is a given distance (e.g. ... 4 lines have the same length. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Efficiently detect sign-changes in python

I want to do exactly what this guy did: Python - count sign changes However I need to optimize it to run ... if __name__=='__main__': main() See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Perpendicular on a line from a given point

How can I draw a perpendicular on a line segment from a given point? My line segment is defined as (x1, y1), (x2 ... to find out this (x4,y4). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - C: How to wrap a float to the interval [-pi, pi)

I'm looking for some nice C code that will accomplish effectively: while (deltaPhase >= M_PI) deltaPhase -= ... M_TWOPI; What are my options? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Confusion between C++ and OpenGL matrix order (row-major vs column-major)

I'm getting thoroughly confused over matrix definitions. I have a matrix class, which holds a float[16] which I ... to OpenGL as column-major? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Are floating point operations in C associative?

Addition mathematically holds the associative property: (a + b) + c = a + (b + c) In the general case, ... it exactly say in the C standard? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - How to concatenate two integers in C

Stack Overflow has this question answered in many other languages, but not C. So I thought I'd ask, since I ... of code. Thanks in Advance! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Getting the decimal part of a double in Swift

I'm trying to separate the decimal and integer parts of a double in swift. I've tried a number of approaches but ... to the number to a string? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Avoiding problems with JavaScript's weird decimal calculations

I just read on MDN that one of the quirks of JS's handling of numbers due to everything being " ... programmers deal with these calculations. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - How to round up value C# to the nearest integer?

I want to round up double to int. Eg, double a=0.4, b=0.5; I want to change them both to integer. so ... is from b. Any formula to do that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Calculating the angle between two lines without having to calculate the slope? (Java)

I have two Lines: L1 and L2. I want to calculate the angle between the two lines. L1 has points: {(x1, y1 ... slope2))); return angle; } Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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