Jan Valdman
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...
plus de 3 ans il y a | 1 réponse | 0
1
réponseQuestion
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...
plus de 5 ans il y a | 1 réponse | 0
1
réponseMinimization 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 ...
plus de 6 ans il y a | 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...
plus de 6 ans il y a | 2 réponses | 1
2
réponsesQuestion
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...
plus de 7 ans il y a | 1 réponse | 0
1
réponseQuestion
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...
environ 8 ans il y a | 2 réponses | 1
2
réponsesQuestion
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=[...
plus de 9 ans il y a | 1 réponse | 0
1
réponsefill3 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...
plus de 10 ans il y a | 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]'...
plus de 10 ans il y a | 2 réponses | 0
2
réponsesQuestion
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...
plus de 13 ans il y a | 1 réponse | 0
