[GH-ISSUE #296] Equation solver does not display all solutions. #127

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opened 2026-05-06 13:15:37 +02:00 by BreizhHardware · 1 comment

BreizhHardware commented

2026-05-06 13:15:37 +02:00

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Originally created by @theodorechle on GitHub (Nov 7, 2022).
Original GitHub issue: https://github.com/UpsilonNumworks/Upsilon/issues/296

I'm sorry if they are errors, I'm French.

Describe the bug
The equation solver does not find all solutions of some equations.

To Reproduce
enter x-2=ln(x)
for the interval [-10, 10], the solver just find 3.146193
but if you search for [0 1], he found 0.1585943 too

Expected behavior
[0, 1] is in [-10, 10], so he must find both.

Screenshots
In a Numworks page, you can see it works normally with Epsilon

Device (please complete the following information):

N110
1.0.1
public version

Edit :
After speaking on Discord, the problem must be with the definition's domain. With the example, ln(x)>0 so the solutions are higher than 0.
In the test with [-10, 10], the definition must be too large so the solver is less precise.

Originally created by @theodorechle on GitHub (Nov 7, 2022). Original GitHub issue: https://github.com/UpsilonNumworks/Upsilon/issues/296 I'm sorry if they are errors, I'm French. **Describe the bug** The equation solver does not find all solutions of some equations. **To Reproduce** enter x-2=ln(x) for the interval [-10, 10], the solver just find 3.146193 but if you search for [0 1], he found 0.1585943 too **Expected behavior** [0, 1] is in [-10, 10], so he must find both. **Screenshots** In a Numworks page, you can see it works normally with Epsilon ![image](https://user-images.githubusercontent.com/109806523/200409268-1e04fc0b-70bd-488d-8320-b5495327709b.png) **Device (please complete the following information):** - N110 - 1.0.1 - public version Edit : After speaking on Discord, the problem must be with the definition's domain. With the example, ln(x)>0 so the solutions are higher than 0. In the test with [-10, 10], the definition must be too large so the solver is less precise.

BreizhHardware commented

2026-05-06 13:15:38 +02:00

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@Overengined commented on GitHub (Mar 5, 2023):

This might be caused by the way the calculator looks for the solution. It is indeed an annoying bug.

@Overengined commented on GitHub (Mar 5, 2023): This might be caused by the way the calculator looks for the solution. It is indeed an annoying bug.