`#2a((1.0))

From: Nicolas Neuss (my.name_at_iwr.uni-heidelberg.de)
Date: 05/25/04 

Date: 25 May 2004 18:20:10 +0200

Hello,

Using CMUCL:

1. (let ((x 1)) `#(,x)) => #(1)

2. The following does not yield #2a((1)) but

(let ((x 1)) `#2a((,x))) => #2A((((LISP::|,|) . X)))

(CLISP gives an error here)

Questions: Is the code in (1) or (2) legal? Should (2) work?

My actual problem is the following: I have written a reader macro #m for
reading in matrices as follows

  (set-dispatch-macro-character
   #\# #\m
   #'(lambda (stream char n)
       (declare (ignore char n))
       (let ((list (read stream nil (values) t)))
         `(make-real-matrix ',list)))))

#m((1.0)) returns an 1x1-matrix with entry 1.0. Now it would sometimes be
practical to be able to say

  (let ((x 1)) `#m((,x)))

Unfortunately, I have not succeeded to modify my code such that this works.

Thank you for any information.

Nicolas

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