Jan Valdman

Last seen: Today | Active since 2010

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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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Path-following method for algebraic inclusions
Implementation of the semismooth* method.

1 month ago | 0 downloads |

Solved

Sum of series I
What is the sum of the following sequence: Σ(2k-1) for k=1...n for different n?

4 months ago

Solved

Counting in Finnish
Sort a vector of single digit whole numbers alphabetically by their name, in Finnish. See the Wikipedia page for <http://en.wik...

4 months ago

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 ...

4 months ago

Solved

Calculate area of sector
A=function(r,seta) r is radius of sector, seta is angle of sector, and A is its area. Area of sector A is defined as 0.5*(r^2...

4 months ago

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

1 year ago | 3 downloads |

Submitted

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

1 year 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 | 1 download |

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....

2 years ago | 1 download |

Submitted

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

2 years ago | 5 downloads |

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...

2 years ago | 1 answer | 0

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answer

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 years ago | 1 download |

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...

4 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...

4 years ago | 1 answer | 0

1

answer

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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...

4 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 = ...

4 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]

4 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...

4 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...

4 years ago

Solved

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

4 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.

4 years ago

Solved

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

4 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>> ...

4 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

Answered
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 ...

5 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...

5 years ago | 2 answers | 1

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