Thomas

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Last seen: 4 mois il y a | Actif depuis 2019

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A simple quaternion class
class with some basic operations on quaternions

environ un an il y a | 1 téléchargement |

A soumis

discrete logarithm
compute the discrete logarithm using Shank's algorithm

environ un an il y a | 1 téléchargement |

Réponse apportée
How to create an array of matrices?
function aM = arrayofmatrices(A,B,C) aM(:,:,1) = A; aM(:,:,2) = B; aM(:,:,3) = C; end This only works when A, B and C hav...

plus d'un an il y a | 0

Question

I try to find a general vector base for all magic squares of dimension n . Why does this program work for n = 3, but not vor n > 3?
The program below is supposed to find a general vector base for all magic squares of dimension n . Why does this program work fo...

plus d'un an il y a | 1 réponse | 0

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How can i check if a matrix is magic square or not?
try: function ismagic = ismagic(M) %ISMAGIC checks if a matrix M is a magic square or not if size(M,1) ~= size(M,2) is...

plus d'un an il y a | 0

Réponse apportée
How can i create array of symbolic expressions?
does this help? function array_of_symbolicExpressions(mx) syms t y(t); y(t) = t^3+t^2; % just an example d = diff(y); ...

plus d'un an il y a | 0

A soumis

Simple Chess game
I tried to keep it "minimalistic", so strength isn't great.

environ 2 ans il y a | 11 téléchargements |

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Two versions of Pollard's rho factorization algorithm
one version with Brent's style cycle detection, one without but using vectors and matrices

plus de 2 ans il y a | 2 téléchargements |

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sieve of Erathostenes
a simple number sieve, which could (in theory) run forever, because it does not require an interval to be sieved.

plus de 2 ans il y a | 1 téléchargement |

Question

why is this Matlab Code faster than the C++ code below? I want to understand what Matlab internally does better and faster than C++
why is this Matlab Code function primes = sieve_era2(N) % sieve of Erathostenes without upper bound of search space (could th...

plus de 2 ans il y a | 2 réponses | 2

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A soumis

find zeros of the Riemann zeta function
This function finds zeros of the Riemann zeta function on the critical line 0.5 + i*t in an interval von <= t <= bis

presque 3 ans il y a | 2 téléchargements |

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Hashlife
a Matlab version of Gosper's hashlife

environ 3 ans il y a | 1 téléchargement |

Question

Approximation of pi is "too precise" .
The function below should approximate pi adding about 2 digits of precision for increasing n. Why is piApprox2(3) exactly = pi ...

plus de 3 ans il y a | 1 réponse | 0

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A soumis

two ways to compute Riemanns prime counting function
one version which works (J2) and one which does not work (J1).

plus de 3 ans il y a | 1 téléchargement |

Question

Cannot start Matlab - getting error "std::exception: Loading D:\Program Files\MATLAB\R2019b\bin\win64\matlab_startup_plugins\Imgrimpl\lib
When I start Matlab from the Desktop Icon or from the task bar, I get this error: "std::exception: Loading D:\Program Files\M...

presque 4 ans il y a | 1 réponse | 4

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A soumis

convert integer to binary or binary to integer
convert a column vetor of integers to a column vector of binaries or vice versa

presque 4 ans il y a | 1 téléchargement |

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zetaRS approximates Riemann's zeta(0.5 + i*t) for large t
Fast computation of Riemann's zeta function on the critical strip using the Riemann Siegel formula.

presque 4 ans il y a | 1 téléchargement |

Question

using fzero with arrayfun searching for zeros inside an interval
I have a function f = @(x) -x.^2+4 with a zero at -2 and +2 using fzero(f, [-3, 1.9]) I get the (correct) zero inside the inte...

presque 4 ans il y a | 1 réponse | 0

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A soumis

Fast approximation of Pi
Approximate Pi with 16th order convergence

environ 4 ans il y a | 1 téléchargement |

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Create and run Turing machines
Some tools and examples for creating and simulating Turing machines and macro-Turing machines.

environ 4 ans il y a | 1 téléchargement |

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Computation of the rado function
More sophisticated check for endless loops, support for parallel execution and the use of macro-Turing-machines

plus de 4 ans il y a | 1 téléchargement |

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uncover the call structure of a recursive function call
recurse(tree) helps to uncover the call structure of a recursive function call.

plus de 4 ans il y a | 1 téléchargement |

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GaussLegendre
quick approximation of pi using the Gauss-Legendre algorithm

plus de 4 ans il y a | 2 téléchargements |

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two versions of the Euler-phi function
two brief implementations of the Eulerphi function

plus de 4 ans il y a | 1 téléchargement |

Question

Extract lines of a three dimensional matrix using an array of indices and NO for-loop
I have a three dimensional 10x5x2 array. Example: r(:,:,1) = [1 0 2 1 1; 2 0 3 1 1; 3 0 4 1 1; 4 0 1 1 -1; 5 0 -1 1 1; 1 1 3 1...

plus de 4 ans il y a | 1 réponse | 0

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A soumis

Computation of Rado-function
Recursive computation of the "uncomputable" Rado-function.

presque 5 ans il y a | 1 téléchargement |

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Karatsuba algorithm for fast multiplication
Multiplication of "x" and "y" with Karatsuba method using base "base" x , y and base can be freely chosen

environ 5 ans il y a | 3 téléchargements |

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Shor Algorithm for prime factoring
A Version of the Shor-Algorithm for prime Factoring. Please feel free to comment on it or recommend improvements.

environ 5 ans il y a | 2 téléchargements |

Question

trying to compute Riemann's prime counting function J(x)
I am trying to compute Riemann's prime counting function J(x): J(x) should approximate the numbers of primes <= x using thi...

environ 5 ans il y a | 2 réponses | 0

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Question

isprime function seems to have poor performance
Why is MatLab's "isprime" function so much slower than Octave's "isprime" function? I am using MatLab's "isprime" function to c...

plus de 5 ans il y a | 4 réponses | 2

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Thomas

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