 Rank: Guest
Groups: Registered
Joined: 04/07/2015(UTC) Posts: 6,866  Was thanked: 981 time(s) in 809 post(s)
|
The two bugs are explained in red in the work sheet. The two bugs: 1. The local definition of the Σ(t) is viable though not obvious for constructing formulas from classical maths litterature. 2. Bézier-Berntein is parametric wrt 't' in the range 0..1____In Lobe, Smath 5346 did support 't:=0,0.01..1' Smath 6179 does not. It needs to read some default value for '0'. It raises the suggestion that 6179 should have an implicit '0 guard'or there is a more sutile bug. In Lobe, set t:=0,0.01..1, tabulate Lobe => "uncertainty" caused by t[0]^0, true but pure theory not applicable in range variable.  Spline Bezier_Bernstein [Lobe Project].sm (51kb) downloaded 30 time(s).
|
|
|
|
|
|
  Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740   Was thanked: 318 time(s) in 268 post(s)
|
Hello Jean, Just to recall this once more Zero^ZeroFor example, if I put the value 10^-17 or some smaller one for the first value in t range in Lobe variable, it seems that calculation will never stop (did not try to debug this). Regards, Radovan EDIT: Actually, it seems it is due to "Uncertainty." error. Edited by user 21 December 2016 11:23:46(UTC)
| Reason: Not specified |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
|
|
|
|
|
Rank: Guest
Groups: Registered
Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
|
Originally Posted by: omorr  Hello Jean, Just to recall this once more Zero^ZeroFor example, if I put the value 10^-17 or some smaller one for the first value in t range in Lobe variable, it seems that calculation will never stop (did not try to debug this). Regards, Radovan EDIT: Actually, it seems it is due to "Uncertainty." error. Same thing here: the smallest 't' is e-15. More puzzling: Smath accepts (e-323)^0 = 1,,,(e-324)^0 = "Uncertainty" The real question is why 5346 takes t=0 but not 6179 [only e-15 or >]. I thing 6179 is missing the default '0' which is quite real whereas no numerical functions in Pentium reports more than 15 decimals. Though they are all or most of them in 21 floating point, they are intentionally truncated to 15 decimals. Thus meet 15 D tabulated references. Thanks Radovan, Jean
|
|
|
|
|
|
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
