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Last seen: 1 year ago Active since 2011

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interpolating missing data
Hi all, I'm trying to estimate model parameters in MATLAB using data I collected in the lab, but I didn't measure all of the ...

10 years ago | 1 answer | 0

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answer

Question


Nonlinear Grey Box Modeling code - really slow or not working?
Hi all, At a Matlab user's great suggestion (see here: http://mathworks.com/matlabcentral/answers/12469-estimating-parameters-...

11 years ago | 2 answers | 0

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answers

Question


estimating parameters for model of 3 differential equations
Hi all, I've been having a lot of trouble figuring out the best way to estimate parameters in Matlab. Does anyone have sugges...

11 years ago | 1 answer | 0

1

answer

Question


Adding weight to data points
Hi all, I'm working on basic model fitting in Matlab and now I'm trying to figure out how to add weight to certain data point...

11 years ago | 0 answers | 0

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answers

Question


fitting logistic growth equation to data
Hi all, I'm trying to fit the logistic growth equation to a set of algae growth data I have to calculate the growth rate, r. ...

11 years ago | 1 answer | 0

1

answer

Question


setting up code to run matrix of parameter values
Hi, I've written the code I've put below to run two functions sequentially. I'm trying to see what the effect of changing the...

11 years ago | 2 answers | 0

2

answers

Question


Running two scripts containing different functions consecutively
Hi, I need to run two scripts (containing two different functions) consecutively and I'm wondering if there's a way to write a s...

11 years ago | 1 answer | 0

1

answer

Question


Constraining equilibrium solver to positive values (fsolve, lsqnonlin)
From my understanding, it's impossible to constrain fsolve to only find positive zeros but that it is possible using lsqnonlin (...

11 years ago | 2 answers | 0

2

answers

Question


fsolve vs. running a model to equilibrium
Hey all, So I've been asking a lot of questions about a set of models I'm trying to find the equilibrium of and I've gotten a l...

11 years ago | 0 answers | 0

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answers

Question


ODE solver for stiff system with 1 variable close to 0
Hi, I'm solving a system of equations to model Daphnia and algae in a chemostat. I've already asked one question about this sys...

11 years ago | 1 answer | 0

1

answer

Question


giant spikes in model from equilibrium when run for relatively long time periods
Hi, I'm working on a model of Daphnia and algae in a chemostat, and when I run the code below for more than 300 days or so, the...

11 years ago | 0 answers | 0

0

answers

Question


Incorrect equilibrium values using fsolve
Hi! I'm using fsolve to find equilibrium values of a series of three differential equations ( the Droop model). I've been using...

11 years ago | 2 answers | 0

2

answers