Free cookie consent management tool by TermsFeed Policy Generator

Opened 16 years ago

Closed 16 years ago

Last modified 14 years ago

#175 closed defect (done)

Format of doubles and floats leads to inconsistency

Reported by: gkronber Owned by: gkronber
Priority: high Milestone: HeuristicLab 3.3.0
Component: Core Version: 3.0
Keywords: Cc:


This ticket overrides ticket #174. While searching for the cause of #174 it was discovered that whenever we transform a floating point number into a string (for instance when serializing or when showing the value in a GUI component) it is likely that the value which is read back is different from the original value.

The underlying cause for this is that the resulting string contains only a part of the digits of the original floating point representation and when reading the string back in it can be altered lightly to create a valid floating point number (base 10 numbers can be periodic in base 2).

This defect was already predicted by swinkler because he solved the same problem in HL2.

Change History (6)

comment:1 Changed 16 years ago by gkronber

  • Owner changed from swagner to gkronber
  • Status changed from new to assigned

Luckily .NET provides the format string r for "round-trip" that adds two additional digits and guarantees that "guarantees that a numeric value converted to a string will be parsed back into the same numeric value." (

comment:2 Changed 16 years ago by gkronber

  • created a branch (r336:r337) and worked on the ticket (changesets r338 r339 r340 r341 r342 r343)
  • merged changes of the branch into the trunk with r344
  • merged changes of the branch and fixed floating point serialization in the stable versions of plugins HeuristicLab.Functions and HeuristicLab.DataAnalysis in the HL3 stable branch

comment:3 Changed 16 years ago by gkronber

  • Resolution set to fixed
  • Status changed from assigned to closed
  • changes for the ticket in stable branch: r345
  • deleted the ticket-specific branch with r346

comment:4 Changed 15 years ago by swagner

  • Milestone changed from 3.0 to Iteration 0

Milestone 3.0 deleted

comment:5 Changed 14 years ago by swagner

  • Milestone changed from Iteration 0 to Current

Milestone Iteration 0 deleted

comment:11 Changed 14 years ago by swagner

  • Milestone changed from Current to HeuristicLab 3.3.0

Milestone Current deleted

Note: See TracTickets for help on using tickets.