For example, if I would make a unit step function uu(x),

to make it simple, using ifFN,
uu(x):=ifFn(x>0,1,0,uu(x))

it’s logically good, but not working
because it cause Resource Exhaustion Error

Is there a way to postpone auto evaluation of expression to avoid Resource Exhaustion Error? as other CAS like Maple.

For information, in such case, Maple code would like that
uu(x):=ifFn(x>0,1,0,’uu(x)’) (It is not actual code).
Using small quotation mark, ‘expression’ returns expression without auto evaluation in Maple.

I want to know is there such a way in nSpire