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John Miller


Active since 2012

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How to solve ODE
Hello, I have following nonlinear ODE-System: G(x)*x'=0 How can I solve this ODE-System with respect to x'=f(x) so I ...

meer dan 12 jaar ago | 1 answer | 0

1

answer

Question


How to use jacobian in a specific case
Hello, I have following code: function dydt = fun_eval(t,x,a) global x0g f1 = [((119*x(2))/27 + (298176679735444...

meer dan 12 jaar ago | 0 answers | 0

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answers

Question


Getting error by inverting a matrix
Hello, I changed a little bit the parameters of my matrix J, but now I dont get the inverse of J. Error message: Erro...

meer dan 12 jaar ago | 0 answers | 0

0

answers

Question


Mass matrix need to be square in ODE-solver?
Hello, I have following differential equation: M(y)*y'=0 with abs(y')=1 where M(y) is a 2x3 Matrix. The ode15s()-...

meer dan 12 jaar ago | 0 answers | 0

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How to use ode() solver
Hello, I have following code: ftod_sym=detofJac(doy); %here I calculate my symbolic vectorfield ftod_sym which is a functi...

meer dan 12 jaar ago | 1 answer | 0

1

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Question


fsolve and truncation error
Hello, how can I display the truncation error when I run fsolve? thank you

meer dan 12 jaar ago | 1 answer | 0

1

answer

Question


fsolve and complex solution?
Hello, my test function is f=x^2+1 the slution is easy : x1=i orx2=-i (both are imaginary) fsolve is not finding these va...

meer dan 12 jaar ago | 1 answer | 0

1

answer

Question


Test of Approximately Equality
Hello, I have a value b and c. b and c are approximatly equal (b~c). They have +-5% difference. I want to test of approxi...

meer dan 12 jaar ago | 3 answers | 0

3

answers

Answered
fmincon and constrains
My function f is a VECTOR ==> fmincon can not handle vectorfield... my f(x) is a function that returns a vector... Has anyone...

meer dan 12 jaar ago | 0

Question


fmincon and constrains
Hello, I have a funktion f(x) f and x are vector which I want to minimize with fmincon() How can I implement fol...

meer dan 12 jaar ago | 3 answers | 0

3

answers

Question


PULSe in Matlab Symbolic
Hi, I have a approximation of a rectangular function: function current=pulse(t) if (t-2.5*round(t/2.5-0.5))<=0.2 ...

meer dan 12 jaar ago | 1 answer | 0

1

answer

Question


step size control in fsolve
Hi, I have f(x,t)=0 for t=[0 10] . fsolve gives me the solutionvector x if the gradient of f is high, the step size of t s...

meer dan 12 jaar ago | 0 answers | 0

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answers

Question


How to catch an error
Hi, if I get an error I want change the algorithm: like this: if ERROR ALGORITHM 2 else ALGORITHM 1 end ...

meer dan 12 jaar ago | 2 answers | 0

2

answers