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Marko


TU Wien

Last seen: 2 months ago |  Active since 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...

2 months ago | 1 answer | 0

1

answer

Question


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...

7 months ago | 1 answer | 0

1

answer

Question


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...

1 year ago | 1 answer | 0

1

answer

Question


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...

1 year ago | 1 answer | 0

1

answer

Question


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...

1 year ago | 3 answers | 0

3

answers

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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...

3 years ago | 2 answers | 0

2

answers

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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...

3 years ago | 1 answer | 0

1

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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...

3 years ago | 2 answers | 0

2

answers

Answered
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...

3 years ago | 0

Question


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...

3 years ago | 2 answers | 0

2

answers

Question


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...

3 years ago | 1 answer | 0

1

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Question


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...

3 years ago | 0 answers | 0

0

answers

Question


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. ...

3 years ago | 1 answer | 0

1

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Question


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 ...

4 years ago | 1 answer | 0

1

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Question


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...

4 years ago | 1 answer | 0

1

answer

Question


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))...

4 years ago | 1 answer | 0

1

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Question


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...

4 years ago | 1 answer | 0

1

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Question


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...

4 years ago | 1 answer | 0

1

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Question


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...

4 years ago | 1 answer | 0

1

answer

Question


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 ...

4 years ago | 2 answers | 1

2

answers