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# 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.

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, and 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 by`jac`

;`r(i - j + ml + mu + 1,j)`

=`dg(i)/dy(j)+cj*dg(i)/dydot(j)`

. If`jac`

returns a full matrix set`band=[]`

- 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 if the given initial condition is compatible:

`g(t0,x0,xdot0)=0`

, and set to 1 if`xdot0`

is just an estimation.

### See Also

- dae — Differential algebraic equations solver

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