https://bugs.kde.org/show_bug.cgi?id=506925

Martin <martin.marmso...@gmail.com> changed:

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                 CC|                            |martin.marmso...@gmail.com

--- Comment #1 from Martin <martin.marmso...@gmail.com> ---
Hello Roger Júnio,

the behaviour you are seeing is correct. Basically you specify the radius with
the equation you are entering.

radius = <your equation>
rotating by phi
So when you wanna have a circle with radius 3 just type 3 into the equation
field

In your example you change the radius with cos(phi):
x = cos(phi) * cos(phi)
y = sin(phi) * cos(phi)

Here you can find another example of a spiral:
https://invent.kde.org/education/labplot/-/merge_requests/750/diffs#17283e1cc265ec2589eda89fdb055b005fcf05e7

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