Jan Valdman
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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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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...
mer än ett år ago | 1 answer | 0
1
answerQuestion
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...
mer än 3 år ago | 1 answer | 0
1
answerMinimization 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 ...
mer än 4 år 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...
mer än 4 år ago | 2 answers | 1
2
answersQuestion
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...
mer än 5 år ago | 1 answer | 0
1
answerQuestion
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...
ungefär 6 år ago | 2 answers | 1
2
answersQuestion
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=[...
mer än 7 år ago | 1 answer | 0
1
answerfill3 command working strangely?
Additinally, I also notice that replacing both commands fill3(X,Y,Z,Z) by patch(X,Y,Z); result in the same issu...
mer än 8 år ago | 0
Question
fill3 command working strangely?
I came accross a difference in the execution of fill3 command in the following code: figure; subplot(1,2,1) X=[0 1 1 0]'...
mer än 8 år ago | 2 answers | 0
2
answersQuestion
Visualizations of finite element calculations too slow?
I have a vectorized finite elements code for my study problems in mechanics, I am very happy with. It computes several fields on...
mer än 11 år ago | 0 answers | 0