Precision is being lost somewhere #602

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1. WhiteBlackGoose

   added

   Bug

   on Oct 9, 2022
2. Happypig375

   added a commit that references this issue on Aug 3, 2026

   Fix parsing of pow(), ToBaseN hangs, and three numeric-precision bugs (…

   ...

   fd43923
3. Rafael-SOWNet commented on Aug 5, 2026

   

   Rafael-SOWNet

   on Aug 5, 2026

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   Checked on current master with the same 1000-digit context from the report:

   MathS.Settings.DecimalPrecisionContext.Set(new EContext(1000, ERounding.HalfEven, -1000, 1000, false));
   "e ^ (-5.4 - 6.3 * 6.56)".EvalNumerical()
   => 5.0849589305248591296438415664064477213715544654835915860879989812686326416257...E-21
   

   which is the right value: the exponent is -46.728, and 10^(-46.728/ln(10)) is about 5.08e-21. The answer of 0 is gone. Closing.
4. Rafael-SOWNet

   closed this as completedon Aug 5, 2026
5. Rafael-SOWNet commented on Aug 5, 2026

   

   Rafael-SOWNet

   on Aug 5, 2026

   Member

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   Fixed on master. Under the same 1000-digit context from the report:

   MathS.Settings.DecimalPrecisionContext.Set(new EContext(1000, ERounding.HalfEven, -1000, 1000, false))
   "e ^ (-5.4 - 6.3 * 6.56)".EvalNumerical()
   => 5.0849589305248591296438415664064477213715544654835915860879989812686326416257128789932429345336662651135511050748629311768584574666707454052271029223590949211744882350780548575153916671192447363687200249369862821524469812300513600451959123464588134831002033566835307753706927934906162059761464021417610755393962746578632525756834846540664879536170104658395017683261610649111455351055303095460622069860864748678081781275062995080307255889695832619736307691230361227349610064182886451255121312022682254702180821081826246390802889521655931759195022830420890309330088164041957687649049268622977836023470195160162278314091729314063721523816803579033420239249911900954939165633805177380548247258724276086429224627081154284780002570095327870284208879179027580442597320770566383886577005257914490659064280482901404345037928386128839508296369995466854848383307368560788748114654369907105009060149768221489818433033386320054074923805931706414544427570515736556610026138912583870776569535368712716044908259311170E-21
   

   The 0 in the report came from the exponential's argument being rounded before the power was taken. Closing.
6. Rafael-SOWNet

   added a commit that references this issue on Aug 8, 2026

   Point AGENTS.md at work that is still open, and at keeping the harness (

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   1f007bc
7. Happypig375

   added the

   Bug

   issue type on Sep 22, 2026
8. Happypig375

   removed

   Bug

   on Sep 22, 2026