# Marko

### TU Wien

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interested in maths, algorithms and fluid dynamics

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**18** Questions

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**Feeds**

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...

3 months ago | 1 answer | 0

### 1

answerQuestion

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...

9 months ago | 1 answer | 0

### 1

answerQuestion

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...

9 months ago | 1 answer | 0

### 1

answerQuestion

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...

10 months ago | 3 answers | 0

### 3

answersSubmitted

Composite Simpson's rule for irregularly spaced data

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

1 year ago | 2 downloads |

Question

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...

2 years ago | 2 answers | 0

### 2

answersQuestion

eigs with Extended Capabilities

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

2 years ago | 1 answer | 0

### 1

answerQuestion

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

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...

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

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 years 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...

3 years 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. ...

3 years 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 ...

3 years 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...

3 years ago | 1 answer | 0

### 1

answerSolved

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...

3 years ago

Solved

Calculate BMI

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

3 years ago

Solved

Calculate Inner Product

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

3 years ago

Solved

Solve a System of Linear Equations

*Example*: If a system of linear equations in _x₁_ and _x₂_ is: 2 _x₁_ + _x₂_ = 2 _x₁...

3 years ago

Solved

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...

3 years ago

Solved

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...

3 years ago

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))...

3 years 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...

3 years 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...

3 years 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...

3 years 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 ...

3 years ago | 2 answers | 1

### 2

answersSolved

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...

7 years ago

Solved

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 [...

7 years ago

Solved

Model a mass spring system

Model an ideal mass-spring system shown below where the spring is initially stretched. <<http://blogs.mathworks.com/images/se...

7 years ago