# Jan Valdman

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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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CONTRIBUTIONS**29** Files

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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

9 months ago | 2 downloads |

Submitted

Evaluation of intrinsic rotations

We provide an alternative to the function rotm2eul from Robotics System Toolbox and comparisons.

11 months ago | 2 downloads |

Submitted

HADAMARD’S INEQUALITY IN THE MEAN

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

1 year ago | 2 downloads |

Submitted

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....

1 year ago | 1 download |

Submitted

Constitutive model of shape memory alloys

An unconstrained minimization of FEM discretized energies.

1 year ago | 8 downloads |

Solved

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 ...

1 year ago

Question

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...

1 year ago | 1 answer | 0

### 1

answerSubmitted

Semismooth* Newton method for contact friction problems

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

3 years 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...

3 years 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...

3 years 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...

3 years 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 = ...

3 years 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]

3 years 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...

3 years 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...

3 years 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.

3 years 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>> ...

3 years 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...

4 years 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...

4 years 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]; ...

4 years 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...

4 years ago

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...

4 years 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 ...

4 years 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...

4 years ago | 2 answers | 1

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answersSubmitted

Simulation of von Kármán viscoelastic plates

A quasistatic evolution of viscoelastic von Kármán plates.

4 years ago | 3 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...

4 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 ...

4 years ago

Solved

Determine if input is odd

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

4 years ago