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See documentation on make-array , in particular :displaced-to and :displaced-index-offset, for example: CL-USER> (defparameter *a* (make-array (list 2 2) :initial-contents '((1 2)(3 4)))) *A* CL-USER> (make-array 2 :displaced-to *a*) #(1 2) CL-USER> (make-array 2 :displaced-to *a* :displaced-index-...

Unfortunately, I believe the only way to do this explicitly is to create a fresh vector and copy over the elements of that row. You can also do this implictly using closures: (defun nth-row (array index) (lambda (col) (aref array index col))) And (let* ((array #2A((1 2) (3 4))) (row-0 (nth-row array...

Alright, figured out what went wrong. I forgot to downcase the keywords during a comparison so instead of getting filtered out they did indeed get evaluated at a later moment. I was totally focussing on the wrong part of the macro when trying to find the problem. All right, it looks like you are ge...

I think you will have a better response if you try contacting Cusp 's mailing list. I don't use Cusp, so I can't help you, this seems to be a problem with Cusp. You may also want to test if slime also gives the same problem, if you already didn't.

Newbies are able to install the free implementation of Python or Ruby in Windows in a couple of clicks. The same newbies try to install a free CL implementation in Windows and spend the next day trying to get Emacs working with Slime and SBCL/CLISP. I have to modify my .emacs file to run SLIME? An ...

Is the reason that Common Lisp receives so much criticism because there really are so many problems in the language that it stops you from using it or is it because people observe a resistance to change the language in the community? I believe it is a bit of both, or sort of. CL has some defects. I...

If you want a shorthand so that instead of writing ",cat" you can write "cat", well, as an option your macro can be macroexpanded into something like this: (defmacro leopard (dog cat*) (let ((catg (gensym))) `(let ((,catg ,cat*)) ,(subst catg 'cat `(if ,dog "war is over"...

This is a very simple task. I'm not going to make everything for you, but, if you can make an algorithm (e.g. in pseudo-language) then it is very simple to transform it into Common Lisp. If you have the algorithm and cannot translate it into CL, you should try learning a bit of CL first.

I don't think there should be a difference in interpreting or compiling the code, it can be a bug. It would be a good thing if you posted the problematic code, or tested it in other implementations.

qbg wrote:

gugamilare wrote:

Harleqin wrote:It seems that you are exactly "reinventing" the NTHCDR function.

On the other hand, by his description, he wants to create a function that like butlast, but with reversed order of arguments.

I think you mean LAST there.

! You are right. I think I was sleepy when I wrote this.