Debian Bug report logs - #1020869
geg: Generates different graphs from equivalent formulas

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Message #5 received at [email protected] (full text, mbox, reply):

From: Sven Geuer <[email protected]>

To: Debian Bug Tracking System <[email protected]>

Subject: geg: Generates different graphs from equivalent formulas

Date: Tue, 27 Sep 2022 21:20:19 +0200

Source: geg
Version: 2.0.9-3
Severity: important
Tags: upstream

Dear Maintainer,

  1/sqrt(1-x^2/100) and
  1/sqrt(1-(x^2)/100)

generate the same wrong graph, while

  1/sqrt(1-0.01x^2)
  1/sqrt(1-(1/100)x^2)
  sqrt(1-x^2/100)^(-1)

each return the expected one.

The error disappears for the non-reciprocal formulas

  sqrt(1-x^2/100)
  sqrt(1-(x^2)/100)
  sqrt(1-0.01x^2)
  sqrt(1-(1/100)x^2)

all of which generate the same expected graph.


-- System Information:
Debian Release: bookworm/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 5.19.0-1-amd64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Message #10 received at [email protected] (full text, mbox, reply):

From: Sven Geuer <[email protected]>

To: [email protected]

Subject: geg: Generates different graphs from equivalent formulas

Date: Sun, 02 Oct 2022 23:22:01 +0200

[Message part 1 (text/plain, inline)]

Here's a simpler formular showing the same erroneous behaviour of geg:

1/x and 1/(x) return the expected graph

while

1/(x/1) returns the horizontal line f(x)=1.

[signature.asc (application/pgp-signature, inline)]

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