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Marko


TU Wien

Last seen: 대략 1개월 전 |  2016년부터 활동

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interested in maths, algorithms and fluid dynamics

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질문


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...

5개월 전 | 답변 수: 1 | 0

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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...

6개월 전 | 답변 수: 1 | 0

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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...

6개월 전 | 답변 수: 3 | 0

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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...

2년 초과 전 | 답변 수: 2 | 0

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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...

2년 초과 전 | 답변 수: 1 | 0

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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...

2년 초과 전 | 답변 수: 2 | 0

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답변 있음
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...

2년 초과 전 | 0

질문


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...

2년 초과 전 | 답변 수: 2 | 0

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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...

2년 초과 전 | 답변 수: 1 | 0

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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...

거의 3년 전 | 답변 수: 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. ...

대략 3년 전 | 답변 수: 1 | 0

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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 ...

대략 3년 전 | 답변 수: 1 | 0

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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...

대략 3년 전 | 답변 수: 1 | 0

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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))...

대략 3년 전 | 답변 수: 1 | 0

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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...

3년 초과 전 | 답변 수: 1 | 0

1

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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...

3년 초과 전 | 답변 수: 1 | 0

1

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질문


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...

3년 초과 전 | 답변 수: 1 | 0

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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 ...

3년 초과 전 | 답변 수: 2 | 1

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