# Jan Valdman

Last seen: 5 giorni fa Attivo dal 2010

Followers: 0   Following: 0

Associate professor of applied mathematics https://sites.google.com/site/janvaldman/ Professional Interests: FEM, nonlinear computational mechanics, a posteriori error estimates, MATLAB vectorizations

All

#### Feeds

Visto da

Inviato

Equilibria of economical models with cost of change
Evaluations of Cournot-Nash and Stackelber-Cournot-Nash equilibria for models with several firms using Gauss method

Inviato

Evaluation of intrinsic rotations
We provide an alternative to the function rotm2eul from Robotics System Toolbox and comparisons.

Inviato

Evaluation of the HADAMARD’S INEQUALITY IN THE MEAN in 2 space-dimensions.

Inviato

Enlarge figure axes by a given factor
Given a figure with (eg. tight) axes, this simple code automatically recalculates and enlarges axes them by a prescribed factor....

Inviato

Constitutive model of shape memory alloys
An unconstrained minimization of FEM discretized energies.

Risolto

Doubling elements in a vector
Given the vector A, return B in which all numbers in A are doubling. So for: A = [ 1 5 8 ] then B = [ 1 1 5 ...

oltre un anno fa

Domanda

quasi-Newton method with initial Hessian + preconditioning
I am heavily dependent on the quasi-Newton method in the minimization of nonlinear energies f(x)-> min discretized by the fi...

oltre un anno fa | 1 risposta | 0

### 1

risposta

Inviato

Semismooth* Newton method for contact friction problems
Finite element solution of a contact problem with a Tresca friction by the semismooth* Newton method.

Risolto

Get all prime factors
List the prime factors for the input number, in decreasing order. List each factor. If the prime factor occurs twice, list it as...

oltre 3 anni fa

Domanda

A fast cell array generation
Dear all, in our optimization procedure, we need to create a cell array 'v_indices' from a vector 'v' and another cell array of...

oltre 3 anni fa | 1 risposta | 0

### 1

risposta

Risolto

Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

oltre 3 anni fa

Risolto

Swap the input arguments
Write a two-input, two-output function that swaps its two input arguments. For example: [q,r] = swap(5,10) returns q = ...

oltre 3 anni fa

Risolto

Reverse the vector
Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]

oltre 3 anni fa

Risolto

Length of the hypotenuse
Given short sides of lengths a and b, calculate the length c of the hypotenuse of the right-angled triangle. <<https://i.imgu...

oltre 3 anni fa

Risolto

Generate a vector like 1,2,2,3,3,3,4,4,4,4
Generate a vector like 1,2,2,3,3,3,4,4,4,4 So if n = 3, then return [1 2 2 3 3 3] And if n = 5, then return [1 2 2...

oltre 3 anni fa

Risolto

Return area of square
Side of square=input=a Area=output=b

oltre 3 anni fa

Risolto

Maximum value in a matrix
Find the maximum value in the given matrix. For example, if A = [1 2 3; 4 7 8; 0 9 1]; then the answer is 9.

oltre 3 anni fa

Risolto

Given a and b, return the sum a+b in c.

oltre 3 anni fa

Risolto

Side of a rhombus
If a rhombus has diagonals of length x and x+1, then what is the length of its side, y? <<https://imgur.com/x6hT6mm.png>> ...

oltre 3 anni fa

Risolto

Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

quasi 4 anni fa

Risolto

Binary numbers
Given a positive, scalar integer n, create a (2^n)-by-n double-precision matrix containing the binary numbers from 0 through 2^n...

quasi 4 anni fa

Risolto

Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; ...

quasi 4 anni fa

Risolto

Length of a short side
Calculate the length of the short side, a, of a right-angled triangle with hypotenuse of length c, and other short side of lengt...

quasi 4 anni fa

Risolto

Return the 3n+1 sequence for n
A Collatz sequence is the sequence where, for a given number n, the next number in the sequence is either n/2 if the number is e...

oltre 4 anni fa

Risposto
Minimization of a function with unknown gradient but known sparsity pattern of its hessian
Dear colleague, based on our discussions from yesterday, I implemented a finite difference scheme for a gradient approximation ...

oltre 4 anni fa | 0

Domanda

Minimization of a function with unknown gradient but known sparsity pattern of its hessian
Dear colleagues, is there a fmincon option to minimize a function without the knowledge of its gradient but providing a sparsit...

oltre 4 anni fa | 2 risposte | 1

### 2

risposte

Inviato

Simulation of von Kármán viscoelastic plates
A quasistatic evolution of viscoelastic von Kármán plates.

Risolto

Pascal's Triangle
Given an integer n >= 0, generate the length n+1 row vector representing the n-th row of <http://en.wikipedia.org/wiki/Pascals_t...

oltre 4 anni fa

Risolto

Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

oltre 4 anni fa

Risolto

Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

oltre 4 anni fa