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See the recommended documentation of this function
daeoptions
set options for dae solver
Calling Sequence
daeoptions()
Description
If it exists in the dae function calling context the variable
%DAEOPTIONS
the dae function use it to sets
options.
This daeoptions function interactively displays a command which should be executed to set various options of the dae solver.
CAUTION: the dae
function checks if this variable
exists and in this case it uses it. For using default values you should
clear this variable. Note that daeoptions
does not
create this variable. To create it you must execute the command line
displayed by daeoptions
.
The variable %DAEOPTIONS
is a list with the following elements:
list(tstop,imode,band,maxstep,stepin,nonneg,isest)
The default value is:
list([],0,[],[],[],0,0)
The meaning of the elements is described below.
- tstop
a real scalar or an empty matrix, gives the maximum time for which
g
is allowed to be evaluated. An empty matrix means "no limits" imposed for time.- imode
if it is 0 dae returns only the user specified time point values if it is 1 dae returns its intermediate computed values.
- band
a two components vector which give the definition
[ml,mu]
of band matrix computed byjac
;r(i - j + ml + mu + 1,j)
=dg(i)/dy(j)+cj*dg(i)/dydot(j)
. Ifjac
returns a full matrix setband=[]
- maxstep
A scalar or an empty matrix, the maximum step size, empty matrix means "no limitation".
- stepin
A scalar or an empty matrix, the minimum step size, empty matrix means "not specified".
- nonneg
A scalar, must be set to 0 if
the solution is known to be non negative.
In the other case it must be set to 1.- isest
A scalar, must be set to 0 is the given initial condition is compatible:
g(t0,x0,xdot0)=0
. 1 an set to 1 ifxdot0
is just an estimation.
See Also
<< dae | Differential Equations, Integration | dasrt >> |