Community Profile # Thomas

### self employed

Last seen: 9 days ago Active since 2019

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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 ...

4 months ago | 1 answer | 0

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

When I start Matlab from the Desktop Icon or from the task bar, I get this error: "std::exception: Loading D:\Program Files\M...

8 months ago | 0 answers | 1

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Submitted

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

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 Submitted

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. 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...

11 months ago | 1 answer | 0

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Fast approximation of Pi
Approximate Pi with 16th order convergence Submitted

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

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

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

GaussLegendre
quick approximation of pi using the Gauss-Legendre algorithm Submitted

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

1 year ago | 1 answer | 0

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Recursive computation of the "uncomputable" Rado-function.

Submitted

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

Submitted

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

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...

2 years ago | 2 answers | 0