Recent questions tagged math

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math - Max square size for unknown number inside rectangle

If I have a set of tiles (squares) which can be any number and they are to fill a container (rectangle) of an ... are all to be the same size. 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 - Mathematically Find Max Value without Conditional Comparison

----------Updated ------------ codymanix and moonshadow have been a big help thus far. I was able to ... find a value VERY close to the max? See Question&Answers more detail:os...

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

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702 views

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math - Find the max of 3 numbers in Java with different data types

Say I have the following three constants: final static int MY_INT1 = 25; final static int MY_INT2 = -10; final ... know what I'm doing wrong. 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 best approximate a geometrical arc with a Bezier curve?

When drawing an Arc in 2D, using a Bezier Curve approximation, how does one calculate the two control points given ... end angle and a radius? See Question&Answers more detail:os...

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

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861 views

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math - How can I safely average two unsigned ints in C++?

Using integer math alone, I'd like to "safely" average two unsigned ints in C++. What I mean by "safely" ... as expected Are there better ways? See Question&Answers more detail:os...

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

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737 views

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math - Get direction (compass) with two longitude/latitude points

I'm working on a "compass" for a mobile-device. I have the following points: point 1 (current location): Latitude ... } return brng - headX; } See Question&Answers more detail:os...

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

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767 views

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math - Perpendicular on a line segment from a given point

I want to calculate a point on a given line that is perpendicular from a given point. I have a line segment ... show up correctly in 3D 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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781 views

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math - Draw a quadratic Bézier curve through three given points

I have three points in 2D and I want to draw a quadratic Bézier curve passing through them. How do I ... curve passes through it as well? See Question&Answers more detail:os...

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

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918 views

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math - Ruby factorial function

I'm going crazy: Where is the Ruby function for factorial? No, I don't need tutorial implementations, I ... it a standard library function? See Question&Answers more detail:os...

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

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821 views

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math - JavaScript: Round to a number of decimal places, but strip extra zeros

Here's the scenario: I'm getting .9999999999999999 when I should be getting 1.0. I can afford to lose a decimal ... as necessary (up to 15). See Question&Answers more detail:os...

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

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1.0k views

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math - Calculate angle between two Latitude/Longitude points

Is there a way to calculate angle between two Latitude/Longitude points? What I am trying to achieve is to know ... two points (Lng/Ltd) Thx See Question&Answers more detail:os...

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

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966 views

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math - Generating triangular/hexagonal coordinates (xyz)

I'm trying to come up with an iterative function that generates xyz coordinates for a hexagonal grid. With a starting hex ... 0, 2 -1,-1, 2 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 - Fastest implementation of sine, cosine and square root in C++ (doesn't need to be much accurate)

I am googling the question for past hour, but there are only points to Taylor Series or some sample ... need exact distance for 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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867 views

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math - What does bitwise XOR (exclusive OR) mean?

I'm trying to understand the binary operators in C# or in general, in particular ^ - exclusive or. For example ... up and learn more about them? See Question&Answers more detail:os...

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

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945 views

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math - Why use softmax as opposed to standard normalization?

In the output layer of a neural network, it is typical to use the softmax function to approximate a probability ... the sum of all outputs? See Question&Answers more detail:os...

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

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903 views

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math - Designing function f(f(n)) == -n

A question I got on my last interview: Design a function f, such that: f(f(n)) == -n Where n is ... for the largest range possible. Any ideas? See Question&Answers more detail:os...

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

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1.1k views

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math - C# decimal take ceiling 2

I want to round my decimal value like 2.2222 to 2.23. When I use round, decimal a = Math.Round((decimal)2.222, 2 ... can I get 2.2222 to 2.23 ? See Question&Answers more detail:os...

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

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1.1k views

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math - Arbitrary precision decimals in C#?

Is there an arbitrary-precision decimal class available for C#? I've seen a couple of arbitrary precision integer ... not quite the same thing. See Question&Answers more detail:os...

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

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1.3k views

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math - Calculating angle between two vectors in python

I am trying to calculate the angle between two lines in python. I searched the internet and found the equation ... in the array is different. See Question&Answers more detail:os...

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

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806 views

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math - Implement page curl on android?

I was surfing the net looking for a nice effect for turning pages on Android and there just doesn't seem to be one ... to to gie it more depth? See Question&Answers more detail:os...

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

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904 views

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math - carry/overflow & subtraction in x86

I'm trying to wrap my head around overflow & carry flags in x86. As I understand it, for addition of signed 2's ... flags as adding A and -B? See Question&Answers more detail:os...

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

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980 views

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math - How do you calculate the axis-aligned bounding box of an ellipse?

If the major axis of the ellipse is vertical or horizontal, it's easy to calculate the bounding box, but what ... the bounding box won't work. See Question&Answers more detail:os...

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

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764 views

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math - How to rotate a matrix in an array in javascript

(disclosure, I'm mostly math illiterate). I have an array in this format: var grid = [ [0,0], [0,1] ... How do I accomplish this in Javascript? See Question&Answers more detail:os...

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

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856 views

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math - Line of intersection between two planes

How can I find the line of intersection between two planes? I know the mathematics idea, and I did ... from the resulted vector programmatically See Question&Answers more detail:os...

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

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742 views

1 answer

math - Drawing part of a Bézier curve by reusing a basic Bézier-curve-function?

Assuming I'm using some graphic API which allows me to draw bezier curves by specifying the 4 necessary points: start, end ... y2); g2.draw(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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779 views

1 answer

math - The possible number of binary search trees that can be created with N keys is given by the Nth catalan number. Why?

This has been bothering me for a while. I know that given N keys to arrange in the form of a binary search ... the article). 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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997 views

1 answer

math - PHP float calculation error when subtracting

I have a very strange issue. If I subtract 2 float vars where one is the result of a mathematical operation I ... can not be a rounding issue. See Question&Answers more detail:os...

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

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1.5k views

1 answer

math - Calculate rotated rectangle size from known bounding box coordinates

I read the Calculate Bounding box coordinates from a rotated rectangle to know how to calculate bounding box coordinates ... not match w and h See Question&Answers more detail:os...

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

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