arraymap.txi


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@code{(require 'array-for-each)}
@ftindex array-for-each


@deffn {Procedure} array-map! array0 proc array1 @dots{}

@var{array1}, @dots{} must have the same number of dimensions as
@var{array0} and have a range for each index which includes the range
for the corresponding index in @var{array0}.  @var{proc} is applied to
each tuple of elements of @var{array1} @dots{} and the result is stored
as the corresponding element in @var{array0}.  The value returned is
unspecified.  The order of application is unspecified.
@end deffn

@defun array-map prototype proc array1 array2 @dots{}

@var{array2}, @dots{} must have the same number of dimensions as
@var{array1} and have a range for each index which includes the
range for the corresponding index in @var{array1}.  @var{proc} is
applied to each tuple of elements of @var{array1}, @var{array2},
@dots{} and the result is stored as the corresponding element in a
new array of type @var{prototype}.  The new array is returned.  The
order of application is unspecified.
@end defun

@defun array-for-each proc array0 @dots{}

@var{proc} is applied to each tuple of elements of @var{array0} @dots{}
in row-major order.  The value returned is unspecified.
@end defun

@defun array-indexes array

Returns an array of lists of indexes for @var{array} such that, if
@var{li} is a list of indexes for which @var{array} is defined,
(equal?  @var{li} (apply array-ref (array-indexes @var{array})
@var{li})).
@end defun

@deffn {Procedure} array-index-map! array proc

applies @var{proc} to the indices of each element of @var{array} in
turn, storing the result in the corresponding element.  The value
returned and the order of application are unspecified.

One can implement @var{array-indexes} as
@example
(define (array-indexes array)
    (let ((ra (apply create-array '#() (array-shape array))))
      (array-index-map! ra (lambda x x))
      ra))
@end example
Another example:
@example
(define (apl:index-generator n)
    (let ((v (make-vector n 1)))
      (array-index-map! v (lambda (i) i))
      v))
@end example
@end deffn

@deffn {Procedure} array-copy! source destination

Copies every element from vector or array @var{source} to the
corresponding element of @var{destination}.  @var{destination} must
have the same rank as @var{source}, and be at least as large in each
dimension.  The order of copying is unspecified.
@end deffn