Bye bye Prime

[Joe Horn]

(08-28-2014 05:48 PM)rprosperi Wrote:  

(08-28-2014 05:44 PM)Joe Horn Wrote:  ...Prime's RPN stack is 128 levels high, no more, regardless of amount of memory available.

I'm curious, what happens when you try to enter the 129th item? I'm sure you checked, and my Prime is not with me.

Same as traditional RPN: the top level gets pushed off the top of the stack and is lost. However, unlike traditional RPN, Prime's top level does not automatically replicate.

EDIT: By the way, this limit of 128 levels is not an RPN-only limitation in Prime. ALL THREE of Prime's history stacks are 128 elements high, but in CAS and Home (Textbook or Algebraic entry modes) those 128 elements include both the inputs and the outputs, whereas in RPN it only includes the outputs. When there are a total of 128 things on ANY history stack (RPN, Textbook/Algebraic, or CAS), putting something new on the bottom of the history stack pushes the top element off that stack and loses it.