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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...

1428 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...

1126 views

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

1071 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

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

897 views

Responded 2 years ago

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....

Posted 2 years ago

THANK YOU !

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

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 ...

742 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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