Displaying 3 results from an estimated 3 matches for "ode45".
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ade45
2010 Sep 16
1
More accurate ODE solver?
Dear All,
I was using rk4 and lsoda to solve a ODE system. However, both of them gave
bad accurate solutions, especially compared with Matlab solver ODE45. For
example, ODE45 gave solutions that can go to a stable level (about 1.6) when
time goes to infinity, however, the solutions from lsoda are decreasing to
very very small (about 1e-130) numbers.
Does R have more accurate ODE solvers as ODE45 in Matlab?
Thank you,
Jane
2012 Jan 30
2
ode() tries to allocate an absurd amount of memory
Hi there R-helpers:
I'm having problems with the function ode() found in the package deSolve.
It seems that when my state variables are too numerous (>33000 elements),
the function throws the following error:
Error in vode(y, times, func, parms, ...) :
cannot allocate memory block of size 137438953456.0 Gb
In addition: Warning message:
In vode(y, times, func, parms, ...) : NAs
2011 Apr 28
1
DLSODA error
Dear R-users,
I'm running an MLE procedure where some ODEs are solved for each iteration
in the maximization process. I use mle2 for the Maximum likelihood and
deSolve for the ODEs.
The problem is that somewhere along the way the ODE solver crashes and I get
the following error message:
DLSODA- Warning..Internal T (=R1) and H (=R2)
are
such that in the machine, T + H = T on the next