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A brief update... So, as Pjstirling suggested, i started modeling APC CLOSS-style and I ran into the following which I consider related enough to the original post, that i deserves to be in the same post... It is easy to write a selector class with a print-object method that instead of something awk...

I see... Pjstirling , I have studied the solution you suggested, it seems to me that indeed I can tweak the pretty printer for the sample task but, in the end, my goal is to program fully functional selectors, complexes, stars, and all the other kind of objects in the Annotated Predicate Calculus (A...

Greetings! I'm trying to write an Annotated Predicate Calculus (APC) manager. Fundamental units in this manager are called selectors and have the structure: [<var> <op> <val>] For example, [color = red] , [size >= 35] , [age IN 20..40] With Set-Macro-Character I can get the Lisp reader to correctly ...

Greetings, this is not homework, but I felt it would be here the best place to post... I'm trying to program a common-lisp macro (sbcl) to set the syntax for defining a rule in a rule-based system. My goal is to allow users to specify rules in a syntax like this: (defrule "name of the rule"...

I see... I'm not sure if "conformal displacement" is what I need , yet... but ROW-MAJOR-AREF looks promising as the base for a wrap class that allows the processing of "slices" (either columns or rows) in matrices... It really doesn't matter if the arrays contain numeric data... ...

Thanks LOGXOR... I hadn't think about ROTATEF... and looks like it is a very good point to start with these reordering functions... As I can see now, the problem seems to be tackling the column-wise operations...But your code is definitely a solid start-point... Just to clraify a little, what I need...

Greetings everyone, I need to write a small program for handling numeric 2D arrays... As a special requirement I need to reorder certain rows and columns within an array... I think the right way to do it is by creating a new displaced array but I don't have the expertise needed for the task... :( I'...

Greetings everyone, I know this sounds very newbie... and it definitely is... I need to define a type of 2D matrix of bits, of size mxn (m rows by n columns), that can be used, either as a vector of rows, or as a vector of columns ... Common Lisp's ability to define bit sequences like #*011011 seems...