Jan Valdman

Last seen: 2 days ago | Active since 2010

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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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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...

1 year ago | 1 answer | 0

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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...

3 years ago | 1 answer | 0

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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 ...

4 years ago | 0

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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...

4 years ago | 2 answers | 1

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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...

5 years ago | 1 answer | 0

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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...

6 years ago | 2 answers | 1

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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=[...

7 years ago | 1 answer | 0

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fill3 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...

8 years ago | 0

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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]'...

8 years ago | 2 answers | 0

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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...

11 years ago | 0 answers | 0

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Jan Valdman

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