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# Pascal Schulthess

### Humboldt University of Berlin

24 total contributions since 2010

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Question

OS X JxBrowser AWT-AppKit Thread Window
Hi everyone, recently I discovered an empty "window" titled JxBrowser AWT-AppKit Thread Window when I call the OS X App Expos...

3 years ago | 0 Answers | 0

### 0

Randomly delete elements of a matrix
Thanks for the quick answers. Maybe I do need to clarify: Let's say I have a 3x4 matrix which looks like: x x x x x x x...

3 years ago | 0

Question

Randomly delete elements of a matrix
Hi guys, how would you, if you have an arbitrary matrix, randomly delete one element in each row and column of said matrix. ...

3 years ago | 4 Answers | 0

### 4

Question

Selectively set parameters to fit to 0 in lsqnonlin
Hi everyone, I was wondering if there's a more elegant and less computing-time consuming way to implement the following probl...

3 years ago | 1 Answers | 0

### 1

Slow convergence of lsqnonlin
Alright, I figured out how to speed up the calculation of the objective function immensely. By breaking it down into matrices an...

3 years ago | 0

| accepted

Question

Slow convergence of lsqnonlin
Hi everyone, I have a convergence problem with lsqnonlin and I hope that someone can help me speed it up. Ok, so what do I...

3 years ago | 2 Answers | 0

### 2

Slow convergence of lsqnonlin
@Sean: [pars, chi2] = lsqnonlin(@objFcn, iniConds, lb, ub, opts, xdata, ydata); with iniConds = lognrnd(mu, sigma,...

3 years ago | 0

Responded

Re: Difference of cost functions in optimization?
Hi, there's no error message. It's more a general question. Ok, so, in the first case, p(2) is basically present in both equatio...

4 years ago | 1038 views

Posted

Difference of cost functions in optimization?
Hi everyone, I'm working quite a long time with lsqnonlin and comparable functions but now I'm wondering if there's a differenc...

4 years ago | 1038 views

Responded

Re: Sparse integer LU decomposition
Steven_Lord" <slord@mathworks.com> wrote in message Ok, my problem statement is to find the left null space of a large sparse ...

5 years ago | 2563 views

Responded

Re: Sparse integer LU decomposition
Ok, let me be a little more precise: Not, I have a large sparse matrix and perform lu decomposition. Ideally, I'd like to conve...

5 years ago | 2563 views

Posted

Sparse integer LU decomposition
Hi everyone, I was wondering if there is the possibility to perform sparse integer LU decomposition preferably with full pivoti...

5 years ago | 2563 views

Responded

Re: Elasticity Coefficients with SimBiology Toolbox
Hi Arthur, thanks for your answer! It's good to know that I did everything as it was intended to be handled. So, yeah me :) A...

6 years ago | 2983 views

Posted

Steady State with SimBiology
Hi everyone, I was surprised to not find a out-of-the-box way to calculate the steady states of a SimBiology model. Or did I mi...

6 years ago | 1683 views

Responded

Re: Elasticity Coefficients with SimBiology Toolbox
Hi Pramod, thanks for the help and sorry for my late answer. What I meant by is response coefficient is the sensitivity of a s...

6 years ago | 2983 views

Posted

Matlab, Git and OS X
Hi everyone, I recently discovered that Matlab is able to handle version control systems such as CVS etc. After doing some read...

6 years ago | 4711 views

Responded

Re: Elasticity Coefficients with SimBiology Toolbox
Hi again, I just noticed that I forgot something in previous post. Is there an "easy" way to calculate the (local/global) respo...

6 years ago | 2983 views

Posted

Elasticity Coefficients with SimBiology Toolbox
Hi everyone, I recently started playing around with the SimBiology Toolbox. Although it tykes some time to get used to, I reall...

6 years ago | 2983 views

Submitted

Sparsity pattern
Apply sparsity pattern of one matrix to another.

6 years ago | 1 downloads |

Responded

Re: mldivide for sparse matrix runs out of memory
Ok, I found something called block matrix pseudoinverse at the wikipedia (http://en.wikipedia.org/wiki/Block_matrix_pseudoinvers...

7 years ago | 4681 views

Responded

Re: mldivide for sparse matrix runs out of memory
Hi Matt, this works great, although I hoped to complete this task a little faster ;) (it takes about 50 minutes) Another idea ...

7 years ago | 4681 views

Responded

Re: create vector without colon
Why don't you first create a vector with 2 columns, and add the third one when you need it?

7 years ago | 1084 views

Posted

mldivide for sparse matrix runs out of memory
Hi everybody, I've read almost all threads here on sparse matrices, lu, qr and so on and it really helped me move forward with ...

7 years ago | 4681 views

Posted

Rank and rref for sparse matrices
Hi everybody, I'm struggling a little with the following problem. I have a highly sparse m x n matrix N (density = 3.6299e-04)...

7 years ago | 2670 views