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Operators

Operators used in matrix expressions fall into three general categories:

prefix operators

are placed in front of operands. For example, uses the sign reverse prefix operator (-) in front of the operand to reverse the sign of each element of .

infix operators

are placed between operands. For example, uses the addition infix operator (+) between operands and to add corresponding elements of the matrices.

postfix operators

are placed after an operand. For example, uses the transpose postfix operator () after the operand to transpose .

Matrix operators are listed in Appendix 1, "SAS/IML Quick Reference," and described in detail in Chapter 20.

Table 4.1 shows the precedence of matrix operators in Interactive Matrix Language.

Priority Group		Operators
I (highest)		^		subscripts	-(prefix)	##	**
II		*	#	<>	><	/	@
III		+	-
IV			//	:
V		<	<=	>	>=	=	^=
VI		&
VII (lowest)		|