Recent questions tagged Math

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math - Is there a calculator with LaTeX-syntax?

When I write math in LaTeX I often need to perform simple arithmetic on numbers in my LaTeX source, like 515. ... cases it does not understand. 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 - Efficient 4x4 matrix inverse (affine transform)

I was hoping someone can point out an efficient formula for 4x4 affine matrix transform. Currently my code uses ... at one point or another? 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's the shortest pair of strings that causes an MD5 collision?

Up to what string length is it possible to use MD5 as a hash without having to worry about the possibility of a ... tested for MD5, SHA1, etc? 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 - Algorithm to compute a Voronoi diagram on a sphere?

I'm looking for a simple (if exists) algorithm to find the Voronoi diagram for a set of points on the surface of a ... ), but I eat C-code 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 - javascript: calculate x% of a number

I am wondering how in javascript if i was given a number (say 10000) and then was given a percentage (say 35.8%) ... how much that is (eg 3580) 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 - Simple physics-based movement

I'm working on a 2D game where I'm trying to accelerate an object to a top speed using some basic physics code ... = ? const float friction = ? 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 - Converting bytes to megabytes

I've seen three ways of doing conversion from bytes to megabytes: megabytes=bytes/1000000 megabytes=bytes/1024/ ... authorities on this one! 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 - Units of a Fourier Transform (FFT) when doing Spectral Analysis of a Signal

My question has to do with the physical meaning of the results of doing a spectral analysis of a signal, ... this would be greatly appreciated! 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 - Formula to draw arcs ending in straight lines, Y as a function of X, starting slope, ending slope, starting point and arc radius?

I'm looking for a math formula that on a graph plotting Y as a function of X, before a specified starting ... a circle of the same radius. 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 convert a spherical velocity coordinates into cartesian

I have a velocity vector in altitude, longitude, altitude, I would like to convert it to Cartesian coordinates, vx,vy ... ) ); return coord; } 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 find polygons in a given set of points and edges?

Consider the following problem: Given N points in plane and M line segments connecting them, find all polygons ( ... fastest solution for this? 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 - Get rid of notation

I have a very large number here but I cannot get rid of the notation. I want it to display only numbers ... but it didn't help. Suggestions? 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 Find Coordinates between two points

simple question here. Lets say I have two points: point 1 x = 0 y = 0 point 2 x = 10 y = 10 How would i find out ... ... 8,8 9,9 10,10 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 - Quaternion rotation without Euler angles

In this comment it was strongly suggested that we should never use Euler angles. I understand that there are some ... to in the linked comment? 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 programming language will enable me to enter a very long number without converting it to floating point?

What would be the best way to do the following. Enter a very long number, lets say 500,000 digits long ... 500,000 digit, positive integer. 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 simplify fractions in C#?

I'm looking for a library or existing code to simplify fractions. Does anyone have anything at hand or any links? ... 30% (always equal to 100%) 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 rounding to nearest 0.05

I am trying to find a way to round values to the nearest 0.05. For example: 0.93 rounds to 0.95 0.81 rounds ... a simple way to do this in Java? 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 - Why the bit operation i & (-i) equals to rightmost bit?

I learned Fenwick Tree algorithm and there was written "i & (-i) equals to rightmost bit". For example, 3 & (-3) = 1, ... is 1 <= i <= 2^31-1. 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 - Javascript sin function issue

I have a problem with Math.sin. I thought it would output the sinus of the given integer. So I tried Math.sin( ... my calculator and it was 0.5. 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 - VBA Double vs Single rounding

in my MS Excel I have different behavior of rounding operations for different data types: In case of Single: ? ... hence it rounds to 6.58 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 an open-ended interval implementation exist for Java?

I've got a classification of certain values in different intervals. Most have the form [20-30], but some are ... closes (or starts) on infinite 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 - intersection and union of polygons

I have polygons defined with their vertices's, and i need to calculate areas of their union and intersection. The ... Thank you for your time. 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 - Mesh Generation for Computational Science in Python

I have a need for a Python module/package that provides a mesh on which I can do computational science? I am ... anyone know of a good package? 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 Calculating future date by adding days to a variable date

I was looking at this post, and it is close to what I need: PHP - How to count 60 days from the add date ... Anyone know how to do that? 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 - How to calculate the 21! (21 factorial) in swift?

I am making fuction that calculate factorial in swift. like this func factorial(factorialNumber: UInt64) -> UInt64 { ... 21 factorial) in swift? 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 - Three.JS Object following a spline path - rotation / tanget issues & constant speed issue

I think my issue is similar to: Orient object's rotation to a spline point tangent in THREE.JS but I ... dummy, would be gratefully received. 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 draw an outline around any line

So I have a arbitary line (See an example shown in fig 1) made up of n points I want to draw an ... defining the points as the intersections? 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 - WPF: Getting new coordinates after a Rotation

With reference to this programming game I am currently building. alt text http://img12.imageshack.us/img12/ ... -6457-470e-bde9-66e8970f7059/ See Question&Answers more detail:os...

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

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