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35 sys:array-row-span
;;; -*- Syntax: Zetalisp; Package: USER; Base: 10; Hade: LISP -*­
(setq big-array (make-array '(1024 1024) :type 'art-q
:initial-value 0»
(setq window (make-array '(512 512) :type 'art-q
:displaced-to big-array
:displaced-index-offset
(array-row-major-index big-array 256 256)
:displaced-conformally t»
For a one-dimensional array, the result of array-row-major-index equals
the supplied subscript.
An error is signalled if some subscript is not valid.
array-row-major-index can be used with the :displaced-index-offset option
of make-array to construct the desired value for multidimensional arrays.
I
sys:array-row-span array Function
sys:array-row-span, given a two-dimensional array, returns the number of
array elements spanned by one of its rows. Normally, this is just equal to
the length of a row (that is, the number of columns), but for conformally
displaced arrays, the length and the span are not equal.
(sys:array-row-span (make-array '(4 5») => 5
(sys:array-row-span (make-array '(4 5)
:displaced-to (make-array '(8 9»
:displaced-conformally t»
=> 9
Note: if the array is conceptually a raster, it is better to use
decode-raster-array instead of sys:array-row-span
array-total-size array Function
Returns the total number of elements in array. The total size of a onedimensional
array is calculated without regard for any fill pointer.
(array-total-size (make-array '(3 5 2») => 30
Note that if fill pointers are being used and you want to know the active
length of the array, you should use length or zl:array-active-Iength.
array-total-size does not return the same value as the product of the
dimensions for conformal arrays.
array-total-size-limit
Constant
Represents the exclusive upper bound on the number of elements of an array.
The value of this is 134217728.