# Marko

### TU Wien

interested in maths, algorithms and fluid dynamics

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**Content Feed**

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...

9 months 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...

10 months 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...

1 year 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...

1 year 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...

1 year 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...

1 year 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...

1 year 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. ...

1 year 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 ...

1 year 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...

1 year ago | 0 answers | 0

### 0

answersSolved

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...

1 year 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 ...

1 year 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|...

1 year 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...

1 year 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...

1 year 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...

1 year 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))...

1 year 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...

1 year 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...

1 year 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...

2 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 ...

2 years ago | 2 answers | 0

### 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...

6 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 [...

6 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...

6 years ago

Solved

Model a falling body

An object is falling freely from a height of 22 meters under the force of gravity. <<http://blogs.mathworks.com/images/seth/c...

6 years ago

Solved

Add offset to a signal

Produce the following signal: <<http://blogs.mathworks.com/images/seth/cody/add-offset-eqn.png>> You should see a downward...

6 years ago

Solved

Area of an equilateral triangle

Calculate the area of an equilateral triangle of side x. <<http://upload.wikimedia.org/wikipedia/commons/e/e0/Equilateral-tr...

6 years ago

Solved

merge two matrices together in one matrix

a= [1 2 3 4]; b=[5 6 7 8]; take the first column from matrix (a)and (b)then insert them in matrix (c) respectively, and so on;...

6 years ago

Solved

angle in regular polygon

Make a function which returns measure of interior angle in x-side regular polygon. x is as input. Please pay attention, that 1 ...

6 years ago