HP-50g plots of cube roots (no negative domain displayed)

[Cliff Stamp]

If I plot y1(x)=x^(1/3), I get no negatives. I did a bit of searching and turned up :

http://www.hpmuseum.org/cgi-sys/cgiwrap/...ead=141921

The solution there was kind of awkward as if you want to plot say :

y1(x)=x^(5/3)

you have to plot :

y1(x) = (cube root(x))^5

as both

y1(x)=x^(5/3)

and

y1(x) = cube root(x^5)

Fail to show the negative domain as the calculator is generating the complex roots when x < 0.

I switched from exact to approx, and turned off complex (under modes/cas) but this does not help. Is there a way to force the calculator to return the real root or are you forced to play with the equation entry which is kind of awkward?