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Dear all, i am fitting an implicit function (SMA Isotherm) z(x,y) with lsqcurvefit but i wonder if there is a better solution...

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Asked 1 year ago

Have you tried contourc instead of contour ? It gives you the contour lines without any plots. [cline]=contour(Z,[1 1]); give...

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Answered 1 year ago

Well, i did. Great toolbox by the way. But I can only get it to work with this published method. So either a NAG or MATLAB ode s...

1388 views

Responded 1 year ago

Thanks Thorsten, that Answer helped me a lot. I don´t think there is such a function. It is a strongly degenerate parabolic-hyp...

Hi, i implemented a BVP-PDE (sedimentation of particles) via the method of lines and solved it with ode23. Works well, little ...

Posted 1 year ago

Hi Folks, i found an implementation in LabView (UTiLIA) and one in filexchange with a bad rating. Does anyone know a matlab imp...

1081 views

Dear all, i am using the method of line in order to discretize a convectionc diffusion PDE. It is a degenerate hyperbolic-parab...

1046 views

Hello, i do need the timestep in my equation. Is there a build in way to do that or do i have to monitor it somehow by storin...

Asked 2 years ago

THANK YOU !

875 views

Responded 2 years ago

Hi, i tried to implement one part of a sedimentation model in Matlab. Because my mathematical background is not so strong ( i ...

Posted 2 years ago

Well i figured it out. Just looping over length(Cna) and fitting as usual. lb and upper bounds helped. Any suggestions (aside o...

866 views

Dear all, the steric mass action model is an implizit equation q=K*(q0-(z+sigma)*q)^z*C/Csalt^z q...[mg/mL] bound protein C....

Hello, is there a way to stop an external routine called from matlab ? E.g when the routine gets stuck or takes too long (bad...

1 Answers

Hi, i have a strongly degenerate quasilinear PDE (sedimentation), describing the change of concentration depending on time an...

Hi, i have a bunch of pictures taken with a microscope. I am analysing the size distribution of bubbles. imfindcircles works ...

Hello, i have a video with ~300*200 points. Several cylindrical cylinders are filmed and an object inside the cylinder will b...

Dear all, i do have data from size distribution measurements. The data is like: number of counts in specific size class ( e.g...

0 Answers

Yes, you are right. I did not see the forest because of all the trees. Actually it is a lot faster this way. I use fmincon wi...

Dear all, following problem: I do have a 5x4 Matrix q(C,Cna) and would like to fit the implicit expression defined in the fun...

Dear all, if plot my results with: h_fit = plot( fitresult,xData, yData,'o') and afterwards modify the markers with: ...

Dear all, i am using lsqnonlin for this purpose. It works. I would like to know if there is a better way to do that? E.g usin...

Dear all, DDE23 is made for constant time delays. Since the solution of a previous step in a variable step size solvers produ...

Dear all, i do have a PDE which describes sedimentation. I do discretize it in space and end up with a system of ode´s. Fairly ...

730 views

Dear all, i do have a PDE which describes sedimentation. I do discretize it in space and end up with a system of ode´s. Fairl...

Hello, the last months i spent some of my time learning a lot about numerical methods for PDE`s. The outcome is an implenenta...

Yeah, that is obvious but i do need the timestep in my ode. With a fixed time step it would be easy but with a variable timestep...

Answered 2 years ago

Hello, i solved an initial BVP by the method of lines in the following way: i=1; dvdt(i)= -omega^2/dx.*((xcen(i)...

Hello, i am not sure how to test my solution for a compressible sediment during centrifguation. I do not use mass but conc...

Hi, i am a bit confused. Hope someone can help me out. Consider the equation du/dt+a(u)du/dx=0 if you would have to get ...

Hello, i hope someone can give me a hint. Or better a solution. But i am glad about any help. I would like to solve an adv...

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