AWE
Solve a parametric problem using asymptotic waveform evaluation (AWE).
Syntax
model.sol(sname).create(fname,"AWE")
model.sol(sname).feature(fname).set(pname,pvalue)
Description
Operation feature. The following properties are accepted:
Table 6-27: Valid AWE Properties
Property
Value
Default
Description
acceptshort
on | off
on
If on, the solver accepts short intervals unconditionally
atol
scalar
0.001
Absolute tolerance for parameter sweep
aweassemble
all | one
all
Either assemble all the needed matrices at once, or one at a time
awefunc
string | vector of strings
 
Expression(s) used in the search algorithm
clist
String array
 
Provide values for constants as input parameters using a string array; for the corresponding constant names, use cname.
cname
String array
 
Provide names of constants as input parameters using a string array; for the corresponding constant values, use clist.
control
String
user
Name of controlling study step.
expeval
scalar | numeric vector
range(0.1,0.1,0.9)
Where to check the error in each subinterval.
expsize
scalar
3
Number of terms in expansion.
exptype
pade | taylor
pade
Use Padé or Taylor expansions to approximate the unknown.
keeplog
on | off
off
Keep warnings in stored log.
minint
scalar
0
The shortest allowed subinterval length
minintactive
on | off
off
If off, rtol times the parameter span is. used. If on, minint is used.
message
String
 
The log message from the last solution process.
outsollinearized
du | u
du
Store the total solution (u) or deviation and linerization point (du), when storelinpoint=off.
plist
scalar | numeric vector
 
Parameter list.
plot
on | off
off
Plot while solving.
plotgroup
String
default
Plot group to use for plot while solving.
pname
vector of strings
 
Parameter names.
pout
plist | psteps
plist
Output either the parameters in plist or the solution at the expansion points.
probesel
all | none | manual
all
The probes to compute.
probes
vector of strings
 
Probes to use when probesel=manual.
romdata
String
new
Tag of the target container for the reduced model (new for a new reduced model).
romReconstruct
true | false
true
Enable reconstruction in the produced reduced model.
rtol
scalar
0.01
Relative tolerance for parameter sweep.
soltypeonline
on | off
off
Create a reduced model,
soltypesol
on | off
on
Perform frequency sweep using the AWE approximation.
storelinpoint
on | off
off
Whether to store the linearization point.
The AWE solver computes expansions of an underlying problem around certain parameter values. In the first step the largest and smallest values of plist are used as expansion points. Using these expansions, the values of one or more functions at intermediate parameter values are computed. If the two expansions give similar enough functional values at these internal points, the interval is accepted and no subdivisions of that particular interval are deemed necessary.
The property awefunc is used to specify the functionals of interest and the property expeval determines at which internal points these functionals are to be evaluated. The values for expeval are given relative the interval. That is, a value of 0.5 means that the functionals are evaluated at the midpoint of each interval. When the functional-values from the two expansions are compared, a check is performed to see if they fulfill the specified tolerances atol and rtol. If neither of the tolerances are fulfilled, the interval is bisected and the process is repeated for each subinterval. Before a bisection is performed a check is made to make sure that the new intervals are not shorter than the shortest allowed. By default the shortest allowed interval is given by the relative tolerance times the length of the interval defined by plist (when minintactive is set to off). If minintactive has been set to on the value of minint is the shortest interval allowed. If minint has been specified, the value of minintactive is on by default. The property acceptshort determines how to handle too short intervals. If acceptshort is set to off and a short interval is detected, the solver is interrupted with an error/warning. If acceptshort is set to on and a short interval is detected, the solver accepts the interval even if the tolerances have not been fulfilled.
In AWE several matrices are needed to compute each expansion. There are two options when it comes to assembling these matrices: With aweassemble set to all everything is assembled in a single call to the Xmesh. With aweassenble set to one, the matrices are assembled one at a time. The first option is faster but requires more memory.