newRPL - build 1255 released! [updated to 1299]

[Claudio L.]

(05-22-2019 08:37 AM)JoJo1973 Wrote:  

(05-22-2019 04:42 AM)The Shadow Wrote:  So what are they? List commands are near and dear to my heart.

Claudio, talking about lists, I've seen you have implemented support for case lists.

If I'm not mistaken, at the moment they behave as normal lists: do they have some special propriety you are planning to add?

I just realized the module that has commands for composite objects is completely missing from the wiki (another thing to fix...), no wonder you are asking what they are. It's just a few I found useful, like RHEAD gives you the head of the reverse list (last element). I'll add that module to the wiki so they show up.

As far as case lists: they are not the same as regular lists. A case list is assumed to have multiple values of the same variable, so operations between them are not the same as regular lists.

For example { A B } { C D } * would normally multiply element by element { A*C B*D }. With case lists, something that could be A or B multiplied by something that could be C or D creates 4 different possible outcomes: {A*C B*C A*D B*D }. This is mainly used internally to evaluate expressions with variables that could have multiple values. Just assign each variable a case list of all possible values and EVAL will return a list of all possible outcomes of the expression.