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Jan Valdman


47 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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Contributions in
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Submitted


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

7 días 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...

18 días 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 ...

18 días ago

Solved


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

18 días 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...

18 días ago

Solved


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

18 días ago

Solved


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

18 días 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

alrededor de 1 mes ago | 4 downloads |

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

6 meses ago | 4 downloads |

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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.

6 meses ago | 5 downloads |

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Submitted


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

8 meses ago | 4 downloads |

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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...

11 meses 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...

11 meses 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...

alrededor de 1 año ago | 1 answer | 0

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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...

alrededor de 1 año 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...

alrededor de 1 año 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...

alrededor de 1 año ago

Submitted


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

alrededor de 1 año ago | 8 downloads |

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

alrededor de 1 año ago | 9 downloads |

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

alrededor de 1 año ago | 10 downloads |

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

alrededor de 1 año ago | 20 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.

más de 1 año 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...

más de 1 año ago | 2 answers | 1

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answers

Submitted


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

alrededor de 2 años ago | 1 download |

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

más de 2 años ago | 6 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...

más de 2 años 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 ...

más de 2 años ago

Solved


Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

más de 2 años ago

Solved


Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

más de 2 años ago

Solved


Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

más de 2 años ago

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