HP 48GX IFT Error: Too Few Arguments

[John Keith]

(06-20-2021 09:39 PM)MNH Wrote:  

(06-19-2021 01:45 AM)Giuseppe Donnini Wrote:  IFT and IFTE were explicitly designed to allow the use of lists in lieu of programs.

I thought they were designed for programs written in stack syntax. I like their compact form.

They are. What Giuseppe is saying is that the arguments to IFT/IFTE can be in the form of lists instead of programs (they can also be null-tagged commands).

Some examples:

Code:


x > { 2 * 1 - } { 2 * 1 + } IFTE

x > :: SWAP :: DROP IFTE

The advantage is that lists and null tags execute faster and take less memory than programs. Unfortunately, RPL commands are inconsistent in terms of what procedure-class objects they will accept. DOSUBS, MAP and STREAM will accept null tags while DOLIST will not. Neither will accept lists.