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function C = GB_spec_apply (C, Mask, accum, op, A, descriptor, thunk)
%GB_SPEC_APPLY a mimic of GrB_apply
%
% Usage:
% C = GB_spec_apply (C, Mask, accum, op, A, descriptor)
% C = GB_spec_apply (C, Mask, accum, op, A, descriptor, thunk)
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
%-------------------------------------------------------------------------------
% get inputs
%-------------------------------------------------------------------------------
if (nargout > 1 || nargin < 6 || nargin > 7)
error ('usage: C = GB_spec_apply (C, Mask, accum, op, A, descriptor, thunk)') ;
end
C = GB_spec_matrix (C) ;
A = GB_spec_matrix (A) ;
[opname optype ztype xtype ytype] = GB_spec_operator (op, C.class) ;
[C_replace Mask_comp Atrans Btrans Mask_struct] = ...
GB_spec_descriptor (descriptor) ;
Mask = GB_spec_getmask (Mask, Mask_struct) ;
%-------------------------------------------------------------------------------
% do the work via a clean *.m interpretation of the entire GraphBLAS spec
%-------------------------------------------------------------------------------
% apply the descriptor to A
if (Atrans)
A.matrix = A.matrix.' ;
A.pattern = A.pattern' ;
end
% T = op(A)
T.matrix = GB_spec_zeros (size (A.matrix), ztype) ;
T.pattern = A.pattern ;
T.class = ztype ;
p = T.pattern ;
if (GB_spec_is_idxunop (opname))
if (nargin < 7)
thunk = 0 ;
end
if (isstruct (thunk))
thunk = GB_mex_cast (thunk.matrix, thunk.class) ;
end
thunk = full (thunk) ;
thunk = GB_mex_cast (thunk, ytype) ;
[m, n] = size (A.matrix) ;
for i = 1:m
for j = 1:n
if (p (i,j))
T.matrix (i,j) = GB_spec_idxunop (opname, A.matrix (i,j), i, j, thunk) ;
end
end
end
elseif (GB_spec_is_positional (opname))
[m, n] = size (A.matrix) ;
for i = 1:m
for j = 1:n
if (p (i,j))
T.matrix (i,j) = GB_spec_unop_positional (opname, i, j) ;
end
end
end
else
x = A.matrix (p) ;
z = GB_spec_op (op, x) ;
T.matrix (p) = z ;
end
% C<Mask> = accum (C,T): apply the accum, then Mask, and return the result
C = GB_spec_accum_mask (C, Mask, accum, T, C_replace, Mask_comp, 0) ;
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