View Issue Details

IDProjectCategoryView StatusLast Update
0000503ascendpygtk guipublic2013-02-26 13:42
Assigned Tojohn 
Status resolvedResolutionwon't fix 
PlatformLinuxOSUbuntuOS Version10.10
Product Version 
Target Version0.9.9Fixed in Version 
Summary0000503: A small value is displayed next to a relation
DescriptionIn the simulation tab, values are displayed next to a relation. It's 0 for some relation. But sometimes, it's some very small value(like 10^-13).
TagsNo tags attached.




2011-04-02 12:55


Screenshot.png (125,944 bytes)
Screenshot.png (125,944 bytes)


2011-04-04 14:49

administrator   ~0000708

The numbers appearing next to relations are the relation residuals. They indicate the calculated difference between the left hand side (LHS) and the right hand side (RHS) of the equation.

Where this value shows '0', it usually indicates that 'direct solution' of the equation was used, so in other words the equation was simple enough that ASCEND could rearrange the formula to solve for the value of the unknown.

Where this value shows a small number, such as 1e-13, it means that the solution of that relation was found by numerical methods; the solution in that case is not exact, but if the relation is shown as solved then it means that the solution was found to the desired tolerance as specified in the solver parameters.

Marking this bug as 'resolved--won't fix' because there is nothing here that needs to change.

One possibly enhancement to ASCEND would be a unified system for setting the display precision, eg significant figures being reported in the GUI. But that is a separate issue.

Issue History

Date Modified Username Field Change
2011-04-02 12:55 BademiChetan New Issue
2011-04-02 12:55 BademiChetan File Added: Screenshot.png
2011-04-04 14:49 john Note Added: 0000708
2011-04-04 14:49 john Status new => resolved
2011-04-04 14:49 john Resolution open => won't fix
2011-04-04 14:49 john Assigned To => john
2013-02-26 13:42 john Target Version => 0.9.9