# Marko

### TU Wien

interested in maths, algorithms and fluid dynamics

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**Content Feed**

Question

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...

2 months ago | 2 answers | 0

### 2

answersset 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...

2 months 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...

2 months ago | 2 answers | 0

### 2

answersQuestion

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 months ago | 1 answer | 0

### 1

answerQuestion

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...

4 months ago | 0 answers | 0

### 0

answersQuestion

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. ...

6 months ago | 1 answer | 0

### 1

answerQuestion

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 ...

8 months ago | 1 answer | 0

### 1

answerQuestion

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...

8 months ago | 0 answers | 0

### 0

answersQuestion

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))...

9 months ago | 1 answer | 0

### 1

answerQuestion

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...

10 months ago | 1 answer | 0

### 1

answerQuestion

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...

10 months ago | 1 answer | 0

### 1

answerQuestion

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...

10 months ago | 1 answer | 0

### 1

answerQuestion

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 ...

10 months ago | 2 answers | 0