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• linear algebra libraries for clusters

  - by Abruzzo Forte e Gentile

  Hi all I need to develop applications doing linear algebra + eigenvalue + linear equation solutions over a cluster of pcs ( I have a lot of machines available ). I discovered Scalapack libraries but they seem to me developed long time ago. Do you know if these are other libs available that I should learn doing math & linear algebra in a…

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• Actionscript-3 random numbers between max and min...

  - by Patrick

  hi, I'm generating a random number between min and max with this code: return min + (max - min) * Math.random(); And it works. However, the random numbers are very little usually between "1 or 3" even if the max is 80. How can I better distribute the random numbers over all range ? thanks

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• Uses of a C++ Arithmetic Promotion Header

  - by OlduvaiHand

  I've been playing around with a set of templates for determining the correct promotion type given two primitive types in C++. The idea is that if you define a custom numeric template, you could use these to determine the return type of, say, the operator+ function based on the class passed to the templates. For example: // Custom numeric…

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• Inverset cot in C#

  - by Ngu Soon Hui

  We know that the inverse of tan is Math.Atan, what about the inverse of cot? cot(x) is defined as cot(x)=1/tan(x)

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• How to compute fmod in C#?

  - by Danvil

  For given floating point numbers x and a, I would like to compute r (and n) such that x = a*n + r . In C/C++ this function is called fmod. However I do not see a convenient function in .NET. Math.DivRem is only for integers ...

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• Operations on Python hashes

  - by cdecker

  I've got a rather strange problem. For a Distributed Hash Table I need to be able to do some simple math operations on MD5 hashes. These include a sum (numeric sum represented by the hash) and a modulo operation. Now I'm wondering what the best way to implement these operations is. I'm using hashlib to calculate the hashes, but since the…

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• Finding the nth number of primes

  - by Braxton Smith

  I can not figure out why this won't work. Please help me from math import sqrt pN = 0 numPrimes = 0 num = 1 def checkPrime(x): '''Check\'s whether a number is a prime or not''' prime = True if(x==2): prime = True elif(x%2==0): prime=False else: root=int(sqrt(x)) for i in range(3,root,2): …

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• Is there something like Sympy for Java?

  - by Shane Fulmer

  I'm looking for a symbolic math library for Java along the lines of sympy for Python. Does anyone know of anything? Thanks!

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• Normalize amplitude and phase with c#

  - by Lehto

  Hey I'm in the situation where i need to do some math related stuff in c# and for that i need some external libarys. The tool i look for should do the following actions: Process sound(wave/mp3): Normalize the amplitude Normalize the phase Any idea which way to go? And is there a big difference if a should to it on mp3 instead of…

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• How to learn geometry for programming?

  - by fig-gnuton

  What's the best way to learn the essentials of geometry (and other types of math) used in drawing/graphics programming - e.g. curves (like bezier curves), transformations, matrices, etc.?

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• How to calculate point along a curve?

  - by Nicros

  I am writing a custom animation for wpf and as a non math guy I have a couple questions... If I am given two Point3D's, the From and To, and assuming the origin is at 0,0,0 how do I calculate a curve between the two points? And once I have the curve 'plotted' and I know its length (how to do that too?) how can I calculate the x,y,z…

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• CODE1 Spoj - cannot solve it

  - by VaioIsBorn

  I am trying to solve the problem Secret Code and it's obviously math problem. The full problem For those who are lazy to go and read, it's like this: a0,a1,a2,...,an - sequence of N numbers B - some number known to us X = a0 + a1*B + a2*(B^2) + a3*(B^3) + ... + an*(B^n) So if you are given B and X, you should find a0,a1,..an. I…

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• NAN mixing float and GLFloat?

  - by carrots

  This often returns NAN ("Not A Number") depending on input: #define PI 3.1415f GLfloat sineEaseIn(GLfloat ratio) { return 1.0f-cosf(ratio * (PI / 2.0f)); } I tried making PI a few digits smaller to see if that would help. No dice. Then I thought it might be a datatype mismatch, but float and glfloat seem to be equivalent: …

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• High speed matrix manipulation in c#?

  - by Donnie

  I'm working on some image manipulation code in c# and need to do some matrix operations (specifically 2D convolution). I have the code written in matlab which uses the conv2 function ... is there a library for C# / .NET that does good high-speed matrix manipulations? I'd be fine if it requires some specific GPU and does the…

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• How to get visible size of DisplayObject with perspective projection

  - by Ain

  The following is entirely a math question. As we know, PerspectiveProjection delivers perspective transformations in 3D represented by the interdependent values of fieldOfView and focalLength according to the following formula: focalLength = stageWidth/2 * (cos(fieldOfView/2) / sin(fieldOfView/2) Bjørn Gunnar Staal has…

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• Why does this code sometimes return NaN?

  - by carrots

  This often returns NAN ("Not A Number") depending on input: #define PI 3.1415f GLfloat sineEaseIn(GLfloat ratio) { return 1.0f-cosf(ratio * (PI / 2.0f)); } I tried making PI a few digits smaller to see if that would help. No dice. Then I thought it might be a datatype mismatch, but float and glfloat seem to be…

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• Inverse cot in C#

  - by Ngu Soon Hui

  We know that the inverse of tan is Math.Atan, what about the inverse of cot? cot(x) is defined as cot(x)=1/tan(x)

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• What is the best method to convert to an Integer in JavaScript?

  - by Mathew Byrne

  There are several different methods for converting floating point numbers to Integers in JavaScript. My question is what method gives the best performance, is most compatible, or is considered the best practice? Here are a few methods that I know of: var a = 2.5; window.parseInt(a); // 2 Math.floor(a); // 2 a…

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• Complex Calculations

  - by mson

  What are the best tools (most efficient) available in .NET (C#) for calculating: integrals partial derivatives other non-trivial math Can people please comment on Mathematica and Matlab and their integration into C#?

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• Senior Project Ideas About Maths and Algorithms

  - by dopache

  Hi, everybody.I am a senior student in CS.I have not much idea about what to do with my senior project.I think any idea will be very helpful to me.I'm very much interested in algorithms and the math behind them.Thanks for any project idea with this subject.

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• c# calculation help

  - by Jonas B

  Hi, I'm pretty useless when it comes to math and I have a problem I need help with. This has nothing to do with schoolwork, it's in fact about alcatel and the ticketextractor. I have two values that needs to be calculated in a c# application according to a formula specified in their documentation: "The global…

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• How would someone implement mathematical formulae in java?

  - by Mohit Deshpande

  What I mean is like have to user input a string with multiple variables and get the value of those variable. Like a simple quadratic formula: x^2 + 5x + 10. Or in java: (Math.pow(x,2)) + (x * 5) + 10The user would then enter that and then the program would solve for x. I will be using the BeanShell Interpreter…

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• Basic string and value functions in Objective-C for iPhone

  - by David Maitland

  I have very little programming knowledge; only a fair bit in Visual Basic. How do I take a value from a text field, then do some simple math such as divide the value by two, then display it back to the user in the same field? In Visual Basic you could just do txtBoxOne.text = txtBoxOne.text / 2 I understand…

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• Why is 0.2 + 0.7 not 0.9? [closed]

  - by jAndy

  Possible Duplicate: Is JavaScript’s math broken? Example: var result = 0.2 + 0.7; alert(result); In Javascript, the result is NOT as expected 0.9 Why?

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• Are there any (somewhat) advanced mathematics Javascript libraries?

  - by pr1001

  Are there any libraries knocking around that provide any additional general purpose math functions for Javascript? Say things like sums over a range, derivatives, integrals, etc. I can imagine that many things aren't possible, so even libraries that do rough approximations would be interesting. Thanks!

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