Recent questions tagged math

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math - Javascript: Round up to the next multiple of 5

I need a utility function that takes in an integer value (ranging from 2 to 5 digits in length) that rounds up to the ... ... How do I do this? 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 - Convert Linear scale to Logarithmic

I have a linear scale that ranges form 0.1 to 10 with increments of change at 0.1: |----------[]- ... for any help provided; this has beaten me. 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 do I implement a Bézier curve in C++?

I'd like to implement a Bézier curve. I've done this in C# before, but I'm totally unfamiliar with the C++ ... I find it? I'm using Linux. 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 - Find point of intersection between two vectors in MATLAB

I have a very simple MATLAB question. What is the easiest way to find the point of intersection between two vectors. ... intersect at (3,3). 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 - Cubic root of the negative number on python

Can someone help me to find a solution on how to calculate a cubic root of the negative number using python ... negative number. Any solutions? 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 does the CPU do subtraction?

I have some basic doubts, but every time I sit to try my hands at interview questions, these questions and my ... component of ALU look like? 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 JavaScript, why does zero divided by zero return NaN, but any other divided by zero return Infinity?

It seems to me that the code console.log(1 / 0) should return NaN, but instead it returns Infinity. However this code: ... x / 0 where x !== 0 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 - Python: max/min builtin functions depend on parameter order

max(float('nan'), 1) evaluates to nan max(1, float('nan')) evaluates to 1 Is it the intended behavior? ... so I just posted a related question. 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 - Is finding the equivalence of two functions undecidable?

Is it impossible to know if two functions are equivalent? For example, a compiler writer wants to determine ... two functions are equivalent? 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 - Angle between two vectors in R

What the most efficient way in the programming language R to calculate the angle between two vectors? 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 do I detect intersections between a circle and any other circle in the same plane?

I'm looking for an algorithm to detect if a circle intersects with any other circle in the same plane (given ... case. Can anybody help me? 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 - why does this simple shuffle algorithm produce biased results? what is a simple reason?

it seems that this simple shuffle algorithm will produce biased results: # suppose $arr is filled with 1 to 52 ... for it to shuffle correctly. 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 - Safest way to convert float to integer in python?

Python's math module contain handy functions like floor & ceil. These functions take a floating point ... use another function altogether? 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 map atan2() to degrees 0-360

atan2(y, x) has that discontinuity at 180° where it switches to -180°..0° going clockwise. How do I map the ... that supports atan2f() will do. 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 a LookAt matrix

I'm in the midst of writing a 3d engine and I've come across the LookAt algorithm described in the DirectX ... this? What does it accomplish? 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 - Quadratic Bézier Curve: Calculate Points

I'd like to calculate a point on a quadratic curve. To use it with the canvas element of HTML5. When I ... "only" knowing this three points? 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 - Signed angle between two 3D vectors with same origin within the same plane

What I need is a signed angle of rotation between two vectors Va and Vb lying within the same 3D plane and ... something. Any ideas? Formulas? 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 - Calculate the center point of multiple latitude/longitude coordinate pairs

Given a set of latitude and longitude points, how can I calculate the latitude and longitude of the center point of ... Lat = atan2(z, hyp) 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 "entropy and information gain"?

I am reading this book (NLTK) and it is confusing. Entropy is defined as: Entropy is the sum of the ... easy, simple example (visual)? 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 - Nth Combination

Is there a direct way of getting the Nth combination of an ordered set of all combinations of nCr? ... enumerating all the previous answers? 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 test randomness (case in point - Shuffling)

First off, this question is ripped out from this question. I did it because I think this part is ... a shuffling algorithm for randomness? 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 - Changing a matrix from right-handed to left-handed coordinate system

I would like to change a 4x4 matrix from a right handed system where: x is left and right, y is front and back ... values, but how do you do it for a matrix? Question&Answers:os...

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

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math - Why isn't `int pow(int base, int exponent)` in the standard C++ libraries?

I feel like I must just be unable to find it. Is there any reason that the C++ pow function does not ... some consistent, explicit way) is not fun to write. Question&Answers:os...

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

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math - How to use nan and inf in C?

I have a numerical method that could return nan or inf if there was an error, and for testing purposed ... only been able to find compiler dependent solutions. Question&Answers:os...

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

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math - Arbitrary-Precision Decimals in C#

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

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math - How do I get whole and fractional parts from double in JSP/Java?

How do I get whole and fractional parts from double in JSP/Java ? If the value is 3.25 then I want to get fractional =.25, whole = 3 How can we do this in Java? Question&Answers:os...

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

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math - What's a good algorithm to determine if an input is a perfect square?

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

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math - What is the best way to evaluate mathematical expressions in C++?

What is the best way to evaluate any custom math expression, for example 3+sqrt(5)+pow(3)+log(5) I know that ... can do that; is there any better way? Thanks! Question&Answers:os...

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

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