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Jan Valdman


Last seen: 11 days ago
50 total contributions since 2010

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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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...

5 months 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 ...

9 months 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...

9 months ago | 2 answers | 1

2

answers

Submitted


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

10 months ago | 3 downloads |

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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...

10 months 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 ...

10 months ago

Solved


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

10 months 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...

10 months ago

Solved


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

10 months ago

Solved


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

10 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

11 months ago | 5 downloads |

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Implementation of C1 FEM
Detailed implementation of Bogner-Fox-Schmit elements.

1 year ago | 1 download |

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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.

1 year ago | 2 downloads |

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Submitted


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

1 year ago | 1 download |

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Solved


Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

1 year ago

Solved


Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

1 year ago

Question


Is there any gradient descent method available?
We are working on the optimization of nonconvex energies in mechanics of solid (see the attached picture) resulting from the fin...

2 years ago | 1 answer | 0

1

answer

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...

2 years ago

Solved


Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

2 years ago

Solved


Interpolator
You have a two vectors, a and b. They are monotonic and the same length. Given a value, va, where va is between a(1) and a(end...

2 years ago

Submitted


Evolutionary model for shape memory alloys
Software for a new article - more details later

2 years ago | 4 downloads |

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Fast elastoplastic FEM assembly
Vectorized assembly of FEM matrices and including complete calculations of elastoplasticity benchmarks.

2 years ago | 7 downloads |

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Submitted


Fast FEM assembly: nodal elements
Vectorized assembly of FEM matrices.

2 years ago | 6 downloads |

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Submitted


Fast FEM assembly: edge elements
Vectorized assembly of FEM matrices.

2 years ago | 11 downloads |

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Submitted


Computation of the Friedrichs and Poincare constants in 2D/3D
Computation of Friedrichs and Poincare constants in 2D/3D from generalized eigenvalue problems.

2 years ago | 1 download |

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Question


Matlab Exchange - More authors to one contribution
We are three persons in a team finishing up a Matlab package to upload. I already have an account, but my colleagues not. If the...

2 years ago | 2 answers | 1

2

answers

Submitted


Error identities for variational problems with obstacles
Calculaton of Error identities for variational problems with obstacles

3 years ago | 2 downloads |

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Submitted


Continuum undergoing combined elasto-plasto-damage transformation.
Time-dependent evolution of the continuum undergoing combined elasto-plasto-damage transformation.

3 years ago | 3 downloads |

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Solved


Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

3 years ago

Solved


Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

3 years ago

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