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Moritz


Active since 2012

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Fitting a gamma distribition to x,y data
Dear all, i do have data from size distribution measurements. The data is like: number of counts in specific size class ( e.g...

mer än 10 år ago | 0 answers | 0

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answers

Answered
fitting implicit function to data
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...

nästan 11 år ago | 0

Question


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

nästan 11 år ago | 2 answers | 1

2

answers

Question


Fitting implicit surface equation
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...

nästan 11 år ago | 0 answers | 0

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answers

Question


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

ungefär 11 år ago | 0 answers | 0

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answers

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Implizit surface fit of SMA Model; better way possible ?
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...

ungefär 11 år ago | 0 answers | 0

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answers

Question


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

ungefär 11 år ago | 0 answers | 0

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answers

Question


Coupled ODE to PDE with Method of lines
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...

ungefär 11 år ago | 0 answers | 0

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answers

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

ungefär 11 år ago | 4

| accepted

Question


Method of lines with e.g ode15s versus time stepping in c++
Hello, the last months i spent some of my time learning a lot about numerical methods for PDE`s. The outcome is an implenenta...

mer än 11 år ago | 0 answers | 0

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answers

Answered
how do i get the timestep of odesolver
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...

mer än 11 år ago | 0

Question


how do i get the timestep of odesolver
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...

mer än 11 år ago | 2 answers | 0

2

answers

Question


bvp4c or classical odesolver
Hello, i solved an initial BVP by the method of lines in the following way: i=1; dvdt(i)= -omega^2/dx.*((xcen(i)...

mer än 11 år ago | 0 answers | 0

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answers

Question


Stopping external Fortran Routine
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...

mer än 11 år ago | 1 answer | 0

1

answer

Question


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

mer än 11 år ago | 0 answers | 0

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answers

Question


characteristic variables for one transport equation
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 ...

mer än 11 år ago | 0 answers | 0

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answers

Question


neuman boundary condtions (no flux) from interior points
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...

nästan 12 år ago | 0 answers | 0

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answers

Question


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

nästan 12 år ago | 0 answers | 0

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answers

Question


degenerate parabolic PDE and pdepe
Hi, i hope someone can help me on that topic: Given a 1 dimensional problem pdepe is what i considered to be the best choi...

nästan 12 år ago | 0 answers | 0

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answers

Question


Formulation of a tricky PDE for pdenonlin or pdetool
Hello everyone, i am trying to implement a mathematical method in my work. Since my profession is biotechnology and not mathe...

nästan 12 år ago | 0 answers | 0

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answers

Answered
PDE with discontinous flux function
Well, RTFM (Read the f... Manual). So it is all described in the PDE Manual at 2.16 i guess.

nästan 12 år ago | 0

Question


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

nästan 12 år ago | 1 answer | 0

1

answer

Question


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

ungefär 12 år ago | 1 answer | 0

1

answer

Question


How to set the region of interest with mouse for video
Hello, i have a video with ~300*200 points. Several cylindrical cylinders are filmed and an object inside the cylinder will b...

ungefär 12 år ago | 1 answer | 0

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answer