View Issue Details

IDProjectCategoryView StatusLast Update
0000104ascendsolverpublic2009-05-01 17:44
Reporterjohn 
Assigned Toart 
PrioritynormalSeverityfeatureReproducibilityalways
Status resolvedResolutionsuspended 
Product Version 
Target VersionFixed in Version 
Summary0000104: initial value modelling
DescriptionFrom the Wiki, [[InitialValueModeling]]

This task is to extend ASCEND's ability to solve initial value differential-algebraic problems. Such problems comprise a mixture of ordinary differential and algebraic equations. The "twist" to this extension is to convert the integration equations for stepping the ODEs into ASCEND models and, initially, to use methods and a Tcl script to do the stepping. In this manner, we do not need to add any new solver code to ASCEND.
TagsNo tags attached.

Relationships

Activities

john

2006-02-25 09:22

administrator   ~0000286

Reminder sent to: art

Out of curiousity Art, what efforts have been made to try to implement the necessary functionality for IVP solving as part of the core engine of ASCEND?

EMSO used the DASSLC solver to solve its models; as far as I could tell the only *language* extensions required were statements to specify the range and timestep, a special 'time' global variable, and a diff(xxx) 'operator' to indicate time derivatives of variables.

john

2009-05-01 17:44

administrator   ~0000502

suspended, not relevant until after GSOC completed

Issue History

Date Modified Username Field Change
2005-10-28 07:41 john New Issue
2005-10-28 07:41 john Severity minor => feature
2005-10-29 02:50 john Status new => assigned
2005-10-29 02:50 john Assigned To => art
2005-11-01 11:24 john Description Updated
2005-11-01 11:25 john Description Updated
2005-11-01 11:25 john Description Updated
2006-02-07 13:19 john Target release => 1.0
2006-02-07 13:23 john Target release 1.0 => 0.9.6
2006-02-25 09:22 john Note Added: 0000286
2006-05-10 02:39 john Target release 0.9.6 => 1.0
2009-05-01 17:44 john Note Added: 0000502
2009-05-01 17:44 john Status assigned => resolved
2009-05-01 17:44 john Resolution open => suspended