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ode solvers optional outputs description
This page describes the the most important values returned in the
optional lhs ode function arguments
These are valid only for the
lsodar ode solver.
For more details, one can look at the solvers fortran code comments in
the step size in t last used (successfully).
the step size to be attempted on the next step.
the current value of the independent variable which the solver has actually reached, i.e. the current internal mesh point in t. on output, tcur will always be at least as far as the argument t, but may be farther (if interpolation was done).
a tolerance scale factor, greater than 1.0, computed when a request for too much accuracy was detected (istate = -3 if detected at the start of the problem, istate = -2 otherwise). if itol is left unaltered but rtol and atol are uniformly scaled up by a factor of
tolsf=w(14)for the next call, then the solver is deemed likely to succeed. (the user may also ignore
tolsfand alter the tolerance parameters in any other way appropriate.)
the value of t at the time of the last method switch, if any. This value is not significant with
the number of
gevaluations for the problem so far. This value is only significant for
the number of steps taken for the problem so far.
the number of f evaluations for the problem so far.
the number of jacobian evaluations (and of matrix lu decompositions) for the problem so far.
the method order last used (successfully).
the order to be attempted on the next step.
the index of the component of largest magnitude in the weighted local error vector ( e(i)/ewt(i) ), on an error return with istate = -4 or -5.
the length of
wactually required, assuming that the length of rwork is to be fixed for the rest of the problem, and that switching may occur. this is defined on normal returns and on an illegal input return for insufficient storage.
the length of
iwactually required, assuming that the length of
iwis to be fixed for the rest of the problem, and that switching may occur. this is defined on normal returns and on an illegal input return for insufficient storage.
the method indicator for the last successful step.. 1 means adams (nonstiff), 2 means bdf (stiff). This value is not significant with
the current method indicator.. 1 means adams (nonstiff), 2 means bdf (stiff). this is the method to be attempted on the next step. thus it differs from
iw(19)only if a method switch has just been made. This value is not significant with
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