[hp50g] how enter the rand function for graphing?

[Juan14]

The program « → X « RAND » » works fine, but when you try to get a graphic it, you get something like y = constant. The only thing that worked for me, was to use X to set a new seed:
« → X « RDZ RAND » »
I stored this program in variable R and set 'Y1(X)=R(X)'