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New functions array-from, array-from*, array-set-from!
* libguile/arrays.h (scm_array_from, scm_array_from_s, scm_array_set_from_x): new declarations. * libguile/arrays.c (scm_array_from, scm_array_from_s, scm_array_set_from_x): new functions, export as array-from, array-from*, array-set-from!.
This commit is contained in:
Daniel Llorens
parent
839dec6325
commit
7d7ada39d0
2 changed files with 159 additions and 0 deletions
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@ -395,6 +395,159 @@ SCM_DEFINE (scm_make_shared_array, "make-shared-array", 2, 0, 1,
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#undef FUNC_NAME
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#define ARRAY_FROM_POS(error_args) \
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scm_t_array_handle handle; \
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scm_array_get_handle (ra, &handle); \
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scm_t_array_dim * s = scm_array_handle_dims (&handle); \
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size_t ndim = scm_array_handle_rank (&handle); \
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size_t k = ndim; \
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ssize_t pos = 0; \
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SCM i = indices; \
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for (; k>0 && scm_is_pair (i); --k, ++s, i=scm_cdr (i)) \
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{ \
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ssize_t ik = scm_to_ssize_t (scm_car (i)); \
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if (ik<s->lbnd || ik>s->ubnd) \
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{ \
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scm_array_handle_release (&handle); \
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scm_misc_error (FUNC_NAME, "indices out of range", error_args); \
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} \
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pos += (ik-s->lbnd) * s->inc; \
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}
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#define ARRAY_FROM_GET_O \
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o = scm_i_make_array (k); \
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SCM_I_ARRAY_SET_V (o, handle.vector); \
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SCM_I_ARRAY_SET_BASE (o, pos + handle.base); \
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scm_t_array_dim * os = SCM_I_ARRAY_DIMS (o); \
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for (; k>0; --k, ++s, ++os) \
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{ \
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os->ubnd = s->ubnd; \
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os->lbnd = s->lbnd; \
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os->inc = s->inc; \
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}
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SCM_DEFINE (scm_array_from_s, "array-from*", 1, 0, 1,
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(SCM ra, SCM indices),
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"Return the array slice @var{ra}[@var{indices} ..., ...]\n"
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"The rank of @var{ra} must equal to the number of indices or larger.\n\n"
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"See also @code{array-ref}, @code{array-from}, @code{array-set-from!}.\n\n"
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"@code{array-from*} may return a rank-0 array. For example:\n"
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"@lisp\n"
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"(array-from* #2((1 2 3) (4 5 6)) 1 1) @result{} #0(5)\n"
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"(array-from* #2((1 2 3) (4 5 6)) 1) @result{} #(4 5 6)\n"
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"(array-from* #2((1 2 3) (4 5 6))) @result{} #2((1 2 3) (4 5 6))\n"
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"(array-from* #0(5) @result{} #0(5).\n"
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"@end lisp")
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#define FUNC_NAME s_scm_array_from_s
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{
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ARRAY_FROM_POS(scm_list_2 (ra, indices))
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SCM o;
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if (k==ndim)
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o = ra;
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else if (scm_is_null (i))
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{ ARRAY_FROM_GET_O }
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else
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{
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scm_array_handle_release (&handle);
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scm_misc_error(FUNC_NAME, "too many indices", scm_list_2 (ra, indices));
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}
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scm_array_handle_release (&handle);
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return o;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_array_from, "array-from", 1, 0, 1,
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(SCM ra, SCM indices),
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"Return the element at the @code{(@var{indices} ...)} position\n"
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"in array @var{ra}, or the array slice @var{ra}[@var{indices} ..., ...]\n"
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"if the rank of @var{ra} is larger than the number of indices.\n\n"
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"See also @code{array-ref}, @code{array-from*}, @code{array-set-from!}.\n\n"
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"@code{array-from} never returns a rank 0 array. For example:\n"
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"@lisp\n"
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"(array-from #2((1 2 3) (4 5 6)) 1 1) @result{} 5\n"
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"(array-from #2((1 2 3) (4 5 6)) 1) @result{} #(4 5 6)\n"
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"(array-from #2((1 2 3) (4 5 6))) @result{} #2((1 2 3) (4 5 6))\n"
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"(array-from #0(5) @result{} 5.\n"
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"@end lisp")
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#define FUNC_NAME s_scm_array_from
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{
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ARRAY_FROM_POS(scm_list_2 (ra, indices))
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SCM o;
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if (k>0)
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{
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if (k==ndim)
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o = ra;
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else
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{ ARRAY_FROM_GET_O }
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}
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else if (scm_is_null(i))
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o = scm_array_handle_ref (&handle, pos);
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else
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{
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scm_array_handle_release (&handle);
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scm_misc_error(FUNC_NAME, "too many indices", scm_list_2 (ra, indices));
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}
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scm_array_handle_release (&handle);
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return o;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_array_set_from_x, "array-set-from!", 2, 0, 1,
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(SCM ra, SCM b, SCM indices),
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"Set the array slice @var{ra}[@var{indices} ..., ...] to @var{b}\n."
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"Equivalent to @code{(array-copy! @var{b} (apply array-from @var{ra} @var{indices}))}\n"
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"if the number of indices is smaller than the rank of @var{ra}; otherwise\n"
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"equivalent to @code{(apply array-set! @var{ra} @var{b} @var{indices})}.\n"
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"This function returns the modified array @var{ra}.\n\n"
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"See also @code{array-ref}, @code{array-from}, @code{array-from*}.\n\n"
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"For example:\n"
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"@lisp\n"
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"(define A (list->array 2 '((1 2 3) (4 5 6))))\n"
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"(array-set-from! A #0(99) 1 1) @result{} #2((1 2 3) (4 #0(99) 6))\n"
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"(array-set-from! A 99 1 1) @result{} #2((1 2 3) (4 99 6))\n"
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"(array-set-from! A #(a b c) 0) @result{} #2((a b c) (4 99 6))\n"
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"(array-set-from! A #2((x y z) (9 8 7))) @result{} #2((x y z) (9 8 7))\n\n"
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"(define B (make-array 0))\n"
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"(array-set-from! B 15) @result{} #0(15)\n"
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"@end lisp")
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#define FUNC_NAME s_scm_array_set_from_x
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{
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ARRAY_FROM_POS(scm_list_3 (ra, b, indices))
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SCM o;
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if (k>0)
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{
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if (k==ndim)
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o = ra;
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else
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{ ARRAY_FROM_GET_O }
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scm_array_handle_release(&handle);
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/* an error is still possible here if o and b don't match. */
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/* TODO copying like this wastes the handle, and the bounds matching
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behavior of array-copy! is not strict. */
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scm_array_copy_x(b, o);
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}
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else if (scm_is_null(i))
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{
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scm_array_handle_set (&handle, pos, b); /* ra may be non-ARRAYP */
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scm_array_handle_release (&handle);
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}
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else
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{
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scm_array_handle_release (&handle);
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scm_misc_error(FUNC_NAME, "too many indices", scm_list_3 (ra, b, indices));
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}
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return ra;
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}
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#undef FUNC_NAME
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#undef ARRAY_FROM_POS
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#undef ARRAY_FROM_GET_O
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/* args are RA . DIMS */
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SCM_DEFINE (scm_transpose_array, "transpose-array", 1, 0, 1,
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(SCM ra, SCM args),
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