Difference between revisions of "SolverInfo"

(Filled in table of problem parameters)
(engine info table)
Line 12: Line 12:
 
The Lp and Engine parameters cannot both be specified in the same call.   
 
The Lp and Engine parameters cannot both be specified in the same call.   
  
−
== Obtaining Information about a Problem Instance ==
+
= Obtaining Information about a Problem Instance =
  
 
You can obtain information about a previously-defined optimization problem using the two-parameter form of SolverInfo:
 
You can obtain information about a previously-defined optimization problem using the two-parameter form of SolverInfo:
Line 45: Line 45:
 
| "setting" || LP,QP,NLP || local .Parameter || numeric
 
| "setting" || LP,QP,NLP || local .Parameter || numeric
 
|-
 
|-
−
| "type" || LP,QP,NLP || atomic || "LP","QP" or "NLP"
+
| "type" || LP,QP,NLP || atomic || "LP","QP", "QCP" or "NLP"
 
|}
 
|}
 +
 +
= Obtaining Information about a Solver Engine =
 +
 +
The usage:
 +
SolverInfo( engine: atomic text ; Item : atomic text )
 +
returns information about a solver engine.  The possible values for Item in this usage are:
 +
 +
{| border="1"
 +
! Item !! Dimensionality !! Type !! Description
 +
|-
 +
| "Setting" || Local .Parameter || numeric || Array of control parameters
 +
|-
 +
| "MaxSetting" || Local .Parameter || numeric || upper bounds for setting
 +
|-
 +
| "MinSetting" || Local .Parameter || numeric || lower bounds for setting
 +
|-
 +
| "Name" || atomic || text || The engine name
 +
|-
 +
| "DLL" || atomic || text || File path to solver engine's DLL
 +
|-
 +
| "TrialPeriod" || atomic || numeric || number of days until Frontline solver trial license expires
 +
|-
 +
| "MaxVars" || atomic || numeric || Maximum number of decision variables supported by engine
 +
|-
 +
| "MaxIntVars" || atomic || numeric || Maximum number of integer variables supported by engine
 +
|-
 +
| "MaxConstraints" || atomic || numeric || Maximum number of constraints supported by engine
 +
|-
 +
| "MaxVarBounds" || atomic || numeric || Maximum number of variable bounds supported by engine.
 +
|-
 +
| "Milliseconds" || atomic || numeric || Time spent in computation.
 +
|-
 +
| "Iterations" || atomic || numeric || # of iterations engine has performed
 +
|-
 +
| "Calls" || atomic || numeric || # of function evaluations that have occurred
 +
|-
 +
| "Jacobians" || atomic || numeric || # of jacobians evaluations that have occurred
 +
|-
 +
| "Hessians" || atomic || numeric || # of hessians evaluations that have occurred
 +
|-

Revision as of 19:57, 18 December 2006

The SolverInfo function provides information about a specific optimizer engine, or about a previously-defined LP, QP or NLP. Its declaration is: 

SolverInfo( lp : optional LP_TYPE ; item : atomic text ; engine : optional atomic text ; 
            ref : optional boolean = False )

Where:

  • lp : A problem instance previously defined by LpDefine, QpDefine or NlpDefine, or returned by FindIIS.
  • item : A description of the desired item(s). See below.
  • engine: The name of a Solver engine.
  • ref : A flag indicating whether a reference to the result should be returned.

The Lp and Engine parameters cannot both be specified in the same call.

Obtaining Information about a Problem Instance

You can obtain information about a previously-defined optimization problem using the two-parameter form of SolverInfo: 

 SolverInfo( lp, item )

For example, to get the variable lower bounds use: 

 SolverInfo( lp, "lb" )

Possible values for the Item are

"Item" Valid For Dimensionality Type
"objcoef" LP, QP Vars numeric
"Q" QP Vars, Vars2 numeric
"lhs" LP, QP Vars, Constraints numeric
"rhs" LP,QP,NLP Constraints numeric
"lb" LP,QP,NLP Vars numeric
"sense" LP,QP,NLP Constraints '>=','<=', or '='
"ub" LP,QP,NLP Vars numeric
"ctype" LP,QP,NLP Vars 'C', 'I', or 'B'
"maximize" LP,QP,NLP atomic True, False
"engine" LP,QP,NLP atomic text
"setting" LP,QP,NLP local .Parameter numeric
"type" LP,QP,NLP atomic "LP","QP", "QCP" or "NLP"

Obtaining Information about a Solver Engine

The usage: 

SolverInfo( engine: atomic text ; Item : atomic text )

returns information about a solver engine. The possible values for Item in this usage are:

Item Dimensionality Type Description
"Setting" Local .Parameter numeric Array of control parameters
"MaxSetting" Local .Parameter numeric upper bounds for setting
"MinSetting" Local .Parameter numeric lower bounds for setting
"Name" atomic text The engine name
"DLL" atomic text File path to solver engine's DLL
"TrialPeriod" atomic numeric number of days until Frontline solver trial license expires
"MaxVars" atomic numeric Maximum number of decision variables supported by engine
"MaxIntVars" atomic numeric Maximum number of integer variables supported by engine
"MaxConstraints" atomic numeric Maximum number of constraints supported by engine
"MaxVarBounds" atomic numeric Maximum number of variable bounds supported by engine.
"Milliseconds" atomic numeric Time spent in computation.
"Iterations" atomic numeric # of iterations engine has performed
"Calls" atomic numeric # of function evaluations that have occurred
"Jacobians" atomic numeric # of jacobians evaluations that have occurred
"Hessians" atomic numeric # of hessians evaluations that have occurred
Comments


You are not allowed to post comments.