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The funcall to predicate is a huge timesink. I tested your program with Clozure CL v1.6 under Windows and without the funcall to predicate it took 0.205 seconds for a list of 10.000 elements. I also rewrote your program in C with Visual C++ 6 using a static array and it took 0.175 seconds. I doubt J...

You may use *load-truename*. While loading this variable is bound to the name and full path of the lisp-file that is currently loading. Since it is only bound while loading you cannot use it directly in your program. You have to assign it to a global variable and then use that instead: (defparameter...

Sorry for the typos. I corrected them. The second code example is tested and working, though. I dont' get what you mean with "composition of relations" (I'm assuming you mean equivalence relations). The idea of composition you gave in your second post cannot be generalized for relations co...

Your code is wrong. A working and much simpler approach would be the following: (defun related-p (a b rel) ; return true if a and b are related according to rel ) (defun combine-relations (rel-1 rel-2) (if (endp rel-1) rel-2 (let ((elm (car rel-1))) (combine-relations (cdr rel-1) (if (related-p (car...

Clozure CL has integrated a full Win32-API right out of the box. But its poorly documented and you already need to know how to program the Win32-API in C to use it successfully.

Just reorder the arguments to append.

Since you made efford to solve the problem yourself (no sane lisp programmer would write the code like you did) i give you a solution. (defun deep-member (elm list) (or (equal elm list) (deep-member elm (car list)) (deep-member elm (cdr list))) But you have to rewrite the code yourself (using cond e...

CLOS doesn't manage a list of all instances automatically because this would be inefficient and unneccessary for most applications. But you can easily maintain such a list yourself with a global variable. (defclass my-class (...) (...)) (defvar *my-class-instances* nil) (defmethod initialize-instanc...