# Jan Valdman

Associate professor of applied mathematics

https://sites.google.com/site/janvaldman/

Professional Interests: FEM, nonlinear computational mechanics, a posteriori error estimates, MATLAB vectorizations

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**Content Feed**

Submitted

Semismooth* Newton method for contact friction problems

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

3 months ago | 5 downloads |

Submitted

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

3 months ago | 6 downloads |

Solved

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...

7 months ago

Question

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...

9 months ago | 1 answer | 0

### 1

answerSolved

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...

10 months ago

Solved

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 = ...

10 months ago

Solved

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]

10 months ago

Solved

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...

10 months ago

Solved

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...

10 months ago

Solved

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.

10 months ago

Solved

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>> ...

10 months ago

Solved

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...

11 months ago

Solved

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...

11 months ago

Solved

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]; ...

11 months ago

Solved

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...

11 months ago

Submitted

Enlarge figure axis by a given factor

Given a 2D figure with (eg. tight) axis, this simple code automatically recalculates axis and enlarges them by a prescribed fact...

11 months ago | 1 download |

Solved

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...

1 year ago

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 ...

1 year ago | 0

Question

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...

1 year ago | 2 answers | 1

### 2

answersSubmitted

Simulation of von Kármán viscoelastic plates

A quasistatic evolution of viscoelastic von Kármán plates.

2 years ago | 2 downloads |

Solved

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...

2 years ago

Solved

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 ...

2 years ago

Solved

Determine if input is odd

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

2 years ago

Solved

Count ones

Write a program to count number of ones (1s) in an integer variable input. For example: Input x=2200112231 output y=3 I...

2 years ago

Solved

Complex number

For complex number c=a+bi, write code that will add a and b together.

2 years ago

Submitted

Implementation of C1 FEM

Detailed implementation of Bogner-Fox-Schmit elements.

2 years ago | 6 downloads |

Submitted

Hyper elasticity with a non-penetration condition

A 2D FEM solver based on an energy minimisation formulated in C^1 deformation including a new non-penetration term.

2 years ago | 1 download |

Submitted

Element-based Solvers

2D Poisson's solver using only local FEM matrices without the global matrix assembly.

2 years ago | 1 download |