Associate professor of applied mathematics

https://sites.google.com/site/janvaldman/

Professional Interests: FEM, nonlinear computational mechanics, a posteriori error estimates, MATLAB vectorizations

Solved

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...

10 days 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 = ...

10 days 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]

10 days 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...

10 days 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...

10 days 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.

11 days 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>> ...

21 days 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...

2 months 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...

2 months 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]; ...

2 months 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...

2 months ago

Submitted

Enlarge figure axis by a given factor

Given a 2D figure with (eg. tight) axis, this simple code automatically recalculates axis and enlarges them by a prescribed fact...

2 months ago | 3 downloads |

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...

8 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 ...

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 ...

12 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...

12 months ago | 2 answers | 1

Submitted

Simulation of von Kármán viscoelastic plates

A quasistatic evolution of viscoelastic von Kármán plates.

1 year ago | 4 downloads |

Solved

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...

1 year 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 ...

1 year ago

Solved

Determine if input is odd

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

1 year 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...

1 year ago

Solved

Complex number

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

1 year 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 | 2 downloads |

Submitted

Implementation of C1 FEM

Detailed implementation of Bogner-Fox-Schmit elements.

1 year ago | 3 downloads |

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 |

Submitted

Element-based Solvers

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

1 year 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...

2 years 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...

2 years 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