LispForum

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 very memory efficient, and I think, maybe it must be defined as two shared (displaced) vectors, one as a vector of rows, and the other as a vector of columns, but I cannot make heads and tails about how to do it...

Maybe, I'm all wrong, and the best thing to do is define normal 2D matrices and provide an interface to handle row or column designations... What do you think?

Can someone please help??

Thanks in advance.

A multi-dimensional bit-array with dimensions m x n can be created by using the Common Lisp MAKE-ARRAY function like this:
Look at Tamas K. Papp's array-operations for the implementation of many array functions.

- edgar