https://bugs.kde.org/show_bug.cgi?id=429110
Bug ID: 429110
Summary: "atan2" function doesn't work as expected
Product: LabPlot2
Version: 2.8.1
Platform: Debian stable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: frontend
Assignee: alexander.se...@web.de
Reporter: ores...@tsc.upc.edu
Target Milestone: ---
SUMMARY
The "atan2" function does not yeld the expected values
STEPS TO REPRODUCE
1. Create new project -> Add a worksheet -> Add an xy-plot -> Add a new
xy-curve from a mathematical equation.
2. As equation, type: "180*atan(1)/pi" and press "recalculate" button.
3. Should appear a stright line plot of value 45 as arctan(1)=45 degrees.
4. Now change the equation to "180*atan2(1,1)/pi", and press "recalculate"
again. The plot should not change, as the "atan2" function is supposed to be
defined as "atan2(Y,X) = atan(Y/X)" but being quadrant-aware. Instead, a
straight-line plot of 90 degrees appears, which is erroneous.
OBSERVED RESULT
A value of 90 degrees
EXPECTED RESULT
A value of 45 degrees
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.14.5
KDE Frameworks Version: 5.54.0
Qt Version: 5.11.3
ADDITIONAL INFORMATION
Labplot2 v2.8.1 compiled from source (git commit d0573f64a0)
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