41 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

Submitted

Implementation of C1 FEM

Detailed implementation of Bogner-Fox-Schmit elements.

5 months ago | 1 download |

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.

5 months ago | 1 download |

Submitted

Element-based Solvers

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

7 months ago | 2 downloads |

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...

10 months 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...

10 months 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...

11 months ago | 1 answer | 0

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...

12 months 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...

12 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 ...

12 months 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...

12 months ago

Submitted

Evolutionary model for shape memory alloys

Software for a new article - more details later

1 year ago | 5 downloads |

Submitted

Fast elastoplastic FEM assembly

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

1 year ago | 8 downloads |

Submitted

Fast FEM assembly: nodal elements

Vectorized assembly of FEM matrices.

1 year ago | 8 downloads |

Submitted

Fast FEM assembly: edge elements

Vectorized assembly of FEM matrices.

1 year ago | 7 downloads |

Submitted

Computation of the Friedrichs and Poincare constants in 2D/3D

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

1 year ago | 4 downloads |

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...

1 year ago | 2 answers | 1

Submitted

Error identities for variational problems with obstacles

Calculaton of Error identities for variational problems with obstacles

2 years ago | 0 downloads |

Submitted

Continuum undergoing combined elasto-plasto-damage transformation.

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

2 years ago | 2 downloads |

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...

2 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 ...

2 years 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...

2 years 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...

2 years 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:...

2 years ago

Submitted

Lagrange polynomial and its subpolynomials

Construction of the Lagrange interpolation polynomial from its definition.

2 years ago | 3 downloads |

Question

vectorization of anonymous function?

I managed to vectorize the function below using inline command: u_function=inline(vectorize('sin(x*y*z^2)'),'x','y','z') x=[...

2 years ago | 1 answer | 0

Submitted

Two-phase obstacle problem in 2D and its aposteriori error estimate

Calculation of two-phase obstacle problem in 2D and its a posteriori error estimate

3 years ago | 1 download |

Submitted

Edges generation

Algorithm generates edges of a conforming 2D/3D triangulation.

3 years ago | 1 download |

Submitted

Quadrature of the absolute value of a function

Quadrature of the absolute value of a function

3 years ago | 0 downloads |

Submitted

Two-phase obstacle problem in 1D and its aposteriori error estimate

Calculation of two-phase obstacle problem and its a posteriori error estimate

3 years ago | 1 download |