Jan Valdman

Last seen: 18 dagen ago | 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.

4 maanden ago | 1 download |

Solved

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

7 maanden 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...

7 maanden 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 ...

7 maanden 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...

7 maanden 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

meer dan een jaar ago | 3 downloads |

Submitted

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

meer dan een jaar ago | 1 download |

Submitted

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

meer dan een jaar 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....

meer dan 2 jaar ago | 1 download |

Submitted

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

meer dan 2 jaar ago | 8 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...

meer dan 2 jaar ago | 1 answer | 0

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Submitted

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

bijna 4 jaar ago | 2 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...

ongeveer 4 jaar 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...

meer dan 4 jaar ago | 1 answer | 0

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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...

meer dan 4 jaar 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 = ...

meer dan 4 jaar 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]

meer dan 4 jaar 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...

meer dan 4 jaar 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...

meer dan 4 jaar ago

Solved

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

meer dan 4 jaar 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.

meer dan 4 jaar ago

Solved

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

meer dan 4 jaar 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>> ...

meer dan 4 jaar 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...

meer dan 4 jaar 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...

meer dan 4 jaar 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]; ...

meer dan 4 jaar 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...

meer dan 4 jaar 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...

bijna 5 jaar 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 ...

meer dan 5 jaar 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...

meer dan 5 jaar ago | 2 answers | 1

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