Sharpsign A (ANSI and GNU Common Lisp Document)

Next: Sharpsign S, Previous: Sharpsign C, Up: Sharpsign

#### 2.4.8.13 Sharpsign A

`#nA`

`#n`A`object` constructs an n-dimensional array, using object as the value of the `:initial-contents` argument to make-array.

For example, `#2A((0 1 5) (foo 2 (hot dog)))` represents a 2-by-3 matrix:

     0       1       5
     foo     2       (hot dog)

In contrast, `#1A((0 1 5) (foo 2 (hot dog)))` represents a vector of length `2` whose elements are lists:

     (0 1 5) (foo 2 (hot dog))

`#0A((0 1 5) (foo 2 (hot dog)))` represents a zero-dimensional array whose sole element is a list:

     ((0 1 5) (foo 2 (hot dog)))

`#0A foo` represents a zero-dimensional array whose sole element is the symbol `foo`. The notation `#1A foo` is not valid because `foo` is not a sequence.

If some dimension of the array whose representation is being parsed is found to be `0`, all dimensions to the right (i.e., the higher numbered dimensions) are also considered to be `0`.

For information on how the Lisp printer prints arrays, see Printing Strings, Printing Bit Vectors, Printing Other Vectors, or Printing Other Arrays.