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Last seen: alrededor de 2 meses hace |  Con actividad desde 2016

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interested in maths, algorithms and fluid dynamics

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model reduction from a database created with xfoil
Hello community, i have created a database with xfoil (2d airfoil panel code with an boundary solver). The database is saved i...

alrededor de 2 meses hace | 1 respuesta | 0

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respuesta

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add / interpolate arrays of different length
Hello community, i have two array's tsol and ysol. Each array has the length of 9; I have also an error estimate array errorEs...

6 meses hace | 1 respuesta | 0

1

respuesta

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exact 2D Chebyshev Interpolation
Hello community, with pseudospectral methods it is possible to obtain a high resoltution solution with a small mesh. I added a...

alrededor de 1 año hace | 1 respuesta | 0

1

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how to solve a simplified 2D trajectory problem with defined points and derivatives
Hello, how could i solve this. Two Points are given, also the velocity and the direction What is the simplest trajectory whic...

alrededor de 1 año hace | 1 respuesta | 0

1

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how can a symbolic derivative be vectorized automatically?
Hello, here is the simplified problem. I have a symblic function with three arguments. And the derivative of f wrt. b syms a...

alrededor de 1 año hace | 3 respuestas | 0

3

respuestas

Enviada


isaVisc
provides the viscosity of the ISA model.

más de 1 año hace | 0 descargas |

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Composite Simpson's rule for irregularly spaced data
Composite Simpson's rule for irregularly spaced data based on a parabolic polynomial fit.

más de 1 año hace | 2 descargas |

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Pregunta


find the minimum objective for a given ode as boundary value problem
Hello Community, could you give me hint how to tackle this problem. I have an ode (c has a positive value): dxdt2 = a+b*t - c...

casi 3 años hace | 2 respuestas | 0

2

respuestas

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eigs with Extended Capabilities
Hello Community, in the documentation of eigs: Extended Capabilities Thread-Based Environment Run code in the background usi...

casi 3 años hace | 1 respuesta | 0

1

respuesta

Pregunta


solve efficiently sparse large linear system of equations
Hello Community, i have a large sparse block structured matrix. with this quadratic sparse Matrix L: is there any faster wa...

alrededor de 3 años hace | 2 respuestas | 0

2

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Respondida
set efficently specific rows in a sparse matrix to 0
here are the benchmark results: ver Var2 ___ _____ 1 2.242 2 NaN 3 0.87 for v...

alrededor de 3 años hace | 0

Pregunta


set efficently specific rows in a sparse matrix to 0
Hello comunity, I have a sparse matrix J and i want to set specific rows to 0. My code's like this: J = sparse(blkdiag(rand(1...

alrededor de 3 años hace | 2 respuestas | 0

2

respuestas

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function interpolation and root finding
Hello community, i have 37 points in in the interval [-.5 .5]. and i'm looking for a minimum. I have written a script which use...

más de 3 años hace | 1 respuesta | 0

1

respuesta

Pregunta


testing SVD Performance on M1
Hello Community, here is a script for testing the M1 performance on solving a SVD Problem. (Parallel Computing Toolbox is requi...

más de 3 años hace | 0 respuestas | 0

0

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vectorize a for loop
Hello Community, i need ur help, to speed up a routine. i have n points in space and i need the distances between all points. ...

más de 3 años hace | 1 respuesta | 0

1

respuesta

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Solve large linear equations with backslash operator. Why is sparse matrix solved slower than the full matrix?
Hello Community and Staff, maybe somebody could explain to me why sparse matrix operation for a not so well condidioned matrix ...

casi 4 años hace | 1 respuesta | 0

1

respuesta

Pregunta


2d Chebyshev polynomial interpolation
Hello Community, may i ask you for your help. I have a full matrix M with the N+1 number of elments in each direction. The x...

casi 4 años hace | 1 respuesta | 0

1

respuesta

Resuelto


Calculate Amount of Cake Frosting
Given two input variables |r| and |h|, which stand for the radius and height of a cake, calculate the surface area of the cake y...

casi 4 años hace

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Calculate BMI
Given a matrix |hw| (height and weight) with two columns, calculate BMI using these formulas: * 1 kilogram = 2.2 pounds * 1 ...

casi 4 años hace

Resuelto


Calculate Inner Product
Given two input matrices, |x| and |y|, check if their inner dimensions match. * If they match, create an output variable |z|...

casi 4 años hace

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Solve a System of Linear Equations
*Example*: If a system of linear equations in _x&#8321_ and _x&#8322_ is: 2 _x₁_ + _x₂_ = 2 _x₁...

casi 4 años hace

Resuelto


Find the Oldest Person in a Room
Given two input vectors: * |name| - user last names * |age| - corresponding age of the person Return the name of the ol...

casi 4 años hace

Resuelto


Convert from Fahrenheit to Celsius
Given an input vector |F| containing temperature values in Fahrenheit, return an output vector |C| that contains the values in C...

casi 4 años hace

Pregunta


how to create a symbolic derivative of f(r(x,y),theta(x,y)) and evaluate it
Hello Community, i have some more or less complicated funtions, e.g. a simple one: f(r,theta) = r*(pi*cos(theta)+2*sin(theta))...

casi 4 años hace | 1 respuesta | 0

1

respuesta

Pregunta


solve large sparse jacobian matrix (with an example)
Hello Community, do you have a good suggestion if an iterative solver would be faster. This jacobian J with ( N = 32 ) took me...

casi 4 años hace | 1 respuesta | 0

1

respuesta

Pregunta


get ridoff "for loops" while defining matrices elements, incl. improvement and reference
Hello Community, is it possible to write a code which is faster than my version? function D = Dp(N) D = (zeros(N-1,N-1)); fo...

casi 4 años hace | 1 respuesta | 0

1

respuesta

Pregunta


simple Matrix manipulation without for-loop needed
Hello Community, i need your help. I have a matrix which size is (N+1,N+1). I have also some vectors with different length. Th...

casi 4 años hace | 1 respuesta | 0

1

respuesta

Pregunta


extract elements and build the remain vector
Hello Community, i need your help. A vector v has 128 elements with random numbers. The elements of index 1 21 31 41 should ...

casi 4 años hace | 2 respuestas | 1

2

respuestas

Resuelto


Make a full wave rectifier
Produce a full wave rectifier waveform for the given sine wave source. For a sine wave input, the output of the full wave rec...

casi 8 años hace

Resuelto


Create an index-powered vector
Given a input vector x, return y as index-powered vector as shown below. Example x = [2 3 6 9] then y should be [...

casi 8 años hace

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