[toronto-lisp] March meeting minutes.

[Abram Hindle]

Well if I use copy-seq I get this error from sbcl:

unhandled TYPE-ERROR in thread #<SB-THREAD:THREAD "initial thread"
RUNNING {10026F2EC1}>:
  The value
    #2A((#\# #\# #\# #\#)
        (#\# #\1 #\  #\#)
        (#\# #\# #\  #\#)
        (#\# #\  #\  #\#)
        (#\# #\2 #\# #\#)
        (#\# #\# #\# #\#))
  is not of type
    SEQUENCE.

(defun copy-array (array)
;  (copy-seq array))
  (let ((dims (array-dimensions array)))
    (adjust-array
     (make-array dims :displaced-to array)
     dims)))

Where as this does not.

Here's the code: http://github.com/abramhindle/csc-club-ai
http://github.com/abramhindle/csc-club-ai/blob/master/common_lisp/Map.lisp

abram

doug at hcsw.org wrote:
> On Sat, Mar 06, 2010 at 07:14:00PM -0500 or thereabouts, Vishvajit Singh wrote:
>> I put up what I can remember of the March meeting on our website:
>> http://www.lisptoronto.org/past-meetings/2010-03-meeting
>> (I also put up Abram's notes from February.)
> 
> - Abram: Common Lisp doesn't have a function to copy an array?
> 
> Copy-seq works on arrays because arrays are sequences. Note that there is a
> special copy-list function which does a deep copy of the list (as opposed to
> the shallow copy done by copy-seq). There are lots of different notions of
> copying, just like there are lots of different types of equality.
> 
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