Continuous Fibonacci Parametric Plot

[Rick314]

Thanks much and now I have the desired graph looking like your provided image. But when I turn on Trace and vary T, I still get "(NaN,NaN)" at all non-integer T values, unlike your display for T=-5.993 that shows the correct values. (I am new to HP Prime and suspect some trivial configuration setting?)

Edit: No need to reply. It all works if I delete the incorrect version I originally posted.