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function [opname optype ztype xtype ytype] = GB_spec_operator (op,optype_default)
%GB_SPEC_OPERATOR get the contents of an operator
%
% On input, op can be a struct with a string op.opname that gives the operator
% name, and a string op.optype with the operator type. Alternatively, op can
% be a string with the operator name, in which case the operator type is given
% by optype_default.
%
% ztype, xtype, and ytype are the types of z, x, and y for z = f(x,y), if
% f is a binary operator, or z = f(x) if f is a unary operator.
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2020, All Rights Reserved.
% http://suitesparse.com See GraphBLAS/Doc/License.txt for license.
if (isempty (op))
% No operator has been defined; return an empty operator. GB_spec_accum
% uses this condition just like the (accum == NULL) condition in the C
% version of GraphBLAS. It means C<Mask>=T is to be done instead of
% C<Mask>=accum(C,T).
opname = '' ;
optype = '' ;
xtype = '' ;
ytype = '' ;
ztype = '' ;
return
elseif (isstruct (op))
% op is a struct with opname and optype
opname = op.opname ;
optype = op.optype ;
else
% op is a string, use the default optype unless the op is just logical
opname = op ;
optype = optype_default ;
end
% xtype is always the optype
xtype = optype ;
% for binary ops: ytype is usually the optype, except for bitshift.
% for unary ops: ytype is 'none'.
ytype = optype ;
% ztype is usually the optype, except for the cases below
ztype = optype ;
is_float = contains (optype, 'single') || contains (optype, 'double') ;
is_complex = contains (optype, 'complex') ;
is_int = contains (optype, 'int') ; % int or uint
is_logical = isequal (optype, 'logical') ;
is_real_float = is_float && ~is_complex ;
%-------------------------------------------------------------------------------
% boolean rename:
%-------------------------------------------------------------------------------
if (is_logical)
switch (opname)
case { 'div' }
opname = 'first' ;
case { 'rdiv' }
opname = 'second' ;
case { 'min', 'times' }
opname = 'and' ;
case { 'max', 'plus' }
opname = 'or' ;
case { 'minus', 'rminus', 'isne', 'ne' }
opname = 'xor' ;
case { 'iseq' }
opname = 'eq' ;
case { 'isgt' }
opname = 'gt' ;
case { 'islt' }
opname = 'lt' ;
case { 'isge', 'pow' }
opname = 'ge' ;
case { 'isle' }
opname = 'le' ;
otherwise
% op not renamed
end
end
%-------------------------------------------------------------------------------
% get the x,y,z types of the operator and check if valid
%-------------------------------------------------------------------------------
switch opname
%--------------------------------------------------------------------------
% binary ops for all 13 types
%--------------------------------------------------------------------------
case { 'first', 'second', 'pow', 'plus', 'minus', 'times', 'div', ...
'rminus', 'rdiv', 'pair', 'any', 'iseq', 'isne' }
% x,y,z types are all the same.
case { 'eq', 'ne' }
% x,y types the the same, z is logical
ztype = 'logical' ;
%--------------------------------------------------------------------------
% binary ops for 11 types (all but complex)
%--------------------------------------------------------------------------
case { 'max', 'min', 'isgt', 'islt', 'isge', 'isle', 'or', 'and', 'xor' }
% x,y,z types are all the same.
% available for 11 real types, not complex
if (is_complex)
error ('invalid op') ;
end
case { 'gt', 'lt', 'ge', 'le' }
% x,y types the the same, z is logical
% available for 11 real types, not complex
ztype = 'logical' ;
if (is_complex)
error ('invalid op') ;
end
%--------------------------------------------------------------------------
% binary ops for real floating point
%--------------------------------------------------------------------------
case { 'atan2', 'hypot', 'fmod', 'remainder', 'ldexp', 'copysign' }
% x,y,z types are all the same.
% available for real float and double only
if (~is_real_float)
error ('invalid op') ;
end
case { 'cmplx', 'complex' }
% x and y are real (float or double). z is the corresponding complex
if (~is_real_float)
error ('invalid op') ;
elseif (isequal (optype, 'single'))
ztype = 'single complex' ;
else
ztype = 'double complex' ;
end
opname = 'cmplx' ;
%--------------------------------------------------------------------------
% binary ops for integer only
%--------------------------------------------------------------------------
case { 'bitor', 'bitand', 'bitxor', 'bitxnor', ...
'bitget', 'bitset', 'bitclr', ...
'bor', 'band', 'bxor', 'bxnor', ...
'bget', 'bset', 'bclr' }
% x,y,z types are all the same.
% available for int and uint only
if (~(is_int))
error ('invalid op') ;
end
switch (opname)
case { 'bitor', 'bor' }
opname = 'bor' ;
case { 'bitand', 'band' }
opname = 'band' ;
case { 'bitxor', 'bxor' }
opname = 'bxor' ;
case { 'bitxnor', 'bxnor' }
opname = 'bxnor' ;
case { 'bitget', 'bget' }
opname = 'bget' ;
case { 'bitset', 'bset' }
opname = 'bset' ;
case { 'bitclr', 'bclr' }
opname = 'bclr' ;
end
case { 'bitshift' , 'bshift' }
% x,z types are the same. y is int8
% available for int and uint only
ytype = 'int8' ;
if (~(is_int))
error ('invalid op') ;
end
%--------------------------------------------------------------------------
% unary ops for all 13 types
%--------------------------------------------------------------------------
case { 'identity', 'one', 'ainv', 'minv' }
% x,y,z types are all the same.
case { 'abs' }
% x,y the same. z is the same as x, except if x is complex
if (isequal (optype, 'single complex'))
ztype = 'single' ;
elseif (isequal (optype, 'double complex'))
ztype = 'double' ;
else
ztype = xtype ;
end
%--------------------------------------------------------------------------
% unary ops for 11 real types
%--------------------------------------------------------------------------
case { 'not' }
% x and z have the same type
if (is_complex)
error ('invalid op') ;
end
ytype = 'none' ;
%--------------------------------------------------------------------------
% unary ops for integer only
%--------------------------------------------------------------------------
case { 'bitnot', 'bnot', 'bitcmp', 'bcmp' }
% x and z have the same type
if (~is_int)
error ('invalid op') ;
end
ytype = 'none' ;
opname = 'bnot' ;
%--------------------------------------------------------------------------
% unary ops for floating-point only (both real and complex)
%--------------------------------------------------------------------------
case { 'sqrt', 'log', 'exp', 'log2', ...
'sin', 'cos', 'tan', ...
'acos', 'asin', 'atan', ...
'sinh', 'cosh', 'tanh', ...
'acosh', 'asinh', 'atanh', ...
'ceil', 'floor', 'round', 'trunc', ...
'exp2', 'expm1', 'log10', 'log1p', ...
'signum' }
% x and z have the same type
if (~is_float)
error ('invalid op') ;
end
ytype = 'none' ;
case { 'isinf', 'isnan', 'isfinite' }
% z is logical
ztype = 'logical' ;
if (~is_float)
error ('invalid op') ;
end
ytype = 'none' ;
%--------------------------------------------------------------------------
% unary ops for real floating-point only
%--------------------------------------------------------------------------
case { 'lgamma', 'tgamma', 'erf', 'erfc', 'frexpx', 'frexpe' }
% x and z have the same type
if (~is_real_float)
error ('invalid op') ;
end
ytype = 'none' ;
%--------------------------------------------------------------------------
% unary ops for complex only
%--------------------------------------------------------------------------
case { 'conj' }
if (~is_complex)
error ('invalid op') ;
end
ytype = 'none' ;
case { 'real', 'imag', 'carg' }
if (~is_complex)
error ('invalid op') ;
end
if (isequal (optype, 'single complex'))
ztype = 'single' ;
else
ztype = 'double' ;
end
ytype = 'none' ;
%--------------------------------------------------------------------------
otherwise
error ('unknown op') ;
end
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