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Darren Wethington


Last seen: 2 years ago |  Active since 2018

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Answered
How to resolve error using erfinv: Input must be real and full?
I'd put a brakpoint at line 173 or run it with the option "Pause on Errors" selected. What are the values of Tc and TaveS(i+1,1...

4 years ago | 0

Question


nlparci() resid length
The documentation for nlparci() says the following: "The confidence interval calculation is valid for systems where the length ...

4 years ago | 1 answer | 0

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answer

Question


Selecting Elements of a Matrix by Indexing with a Vector
I have a 100x3 matrix and I'd like to select one element from each row to form a 100x1 vector. Given a vector of 100 indeces be...

4 years ago | 2 answers | 0

2

answers

Answered
Getting values from 4d matrix according (using) 2d matrix with logical values (0 or 1) - does not work as wanted
See if this is what you're looking for: A = rand(10,20,30,40); B = round(rand(10,20)); four_dim_logical = zeros(size(A)); ...

5 years ago | 0

Answered
problem with optimoptions with fmincon
Your problem is working as you expect it on my machine. The problem for me is the LogLikelihood11 function is iterating at ~2 s...

5 years ago | 0

Question


Why is det(x) better than rcond(x) in determining non-singularity here?
The code below demonstrates the following problem: Analytically, the matrix x is NOT singular [1]. Matlab believes it is singu...

5 years ago | 2 answers | 1

2

answers

Answered
Events not consistently triggering with ODE45
I've been digging around Matlab's ODE Events and searching documentation this week when I came across this question. I was able...

5 years ago | 0

Question


Why does this ODE yield two events?
I have the following simple ODE: With initial condition x(0)=5, I am interested in when x(t)==1. So I have the following eve...

5 years ago | 0 answers | 1

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Question


How would I check to see if a struct field exists OR is empty?
I'd like to program a conditional statement that checks if an optional events function for an ODE was triggered. This would loo...

5 years ago | 2 answers | 0

2

answers

Question


Bounded Confidence Intervals from nlparci
I've calculated parameter values to a model using lsqcurvefit(). These parameters have lower bounds of 0, which I've specified ...

6 years ago | 1 answer | 0

1

answer

Answered
Not enough input arguments error in nlinfit
When passing arguments to nlinfit, you've (correctly) passed your inputs as one variable, "inputs". Now my_fun will take "initi...

6 years ago | 1