CLEM operators (SPSS Modeler)

CLEM operators

This page lists the available CLEM language operators.

Table 1. CLEM language operators
Operation	Comments	Precedence (see next section)
`or`	Used between two CLEM expressions. Returns a value of true if either is true or if both are true.	10
`and`	Used between two CLEM expressions. Returns a value of true if both are true.	9
`=`	Used between any two comparable items. Returns true if ITEM1 is equal to ITEM2.	7
`==`	Identical to `=`.	7
`/=`	Used between any two comparable items. Returns true if ITEM1 is not equal to ITEM2.	7
`/==`	Identical to `/=`.	7
`>`	Used between any two comparable items. Returns true if ITEM1 is strictly greater than ITEM2.	6
`>=`	Used between any two comparable items. Returns true if ITEM1 is greater than or equal to ITEM2.	6
`<`	Used between any two comparable items. Returns true if ITEM1 is strictly less than ITEM2	6
`<=`	Used between any two comparable items. Returns true if ITEM1 is less than or equal to ITEM2.	6
`&&=_0`	Used between two integers. Equivalent to the Boolean expression INT1 && INT2 = 0.	6
`&&/=_0`	Used between two integers. Equivalent to the Boolean expression INT1 && INT2 /= 0.	6
`+`	Adds two numbers: NUM1 + NUM2.	5
`><`	Concatenates two strings; for example, `STRING1 >< STRING2`.	5
`-`	Subtracts one number from another: NUM1 - NUM2. Can also be used in front of a number: - NUM.	5
`*`	Used to multiply two numbers: NUM1 * NUM2.	4
`&&`	Used between two integers. The result is the bitwise 'and' of the integers INT1 and INT2.	4
`&&~~`	Used between two integers. The result is the bitwise 'and' of INT1 and the bitwise complement of INT2.	4
`\|\|`	Used between two integers. The result is the bitwise 'inclusive or' of INT1 and INT2.	4
`~~`	Used in front of an integer. Produces the bitwise complement of INT.	4
`\|\|/&`	Used between two integers. The result is the bitwise 'exclusive or' of INT1 and INT2.	4
`INT1 << N`	Used between two integers. Produces the bit pattern of INT shifted left by N positions.	4
`INT1 >> N`	Used between two integers. Produces the bit pattern of INT shifted right by N positions.	4
`/`	Used to divide one number by another: NUM1 / NUM2.	4
`**`	Used between two numbers: BASE ** POWER. Returns BASE raised to the power POWER.	3
`rem`	Used between two integers: INT1 rem INT2. Returns the remainder, INT1 - (INT1 div INT2) * INT2.	2
`div`	Used between two integers: INT1 div INT2. Performs integer division.	2

Operator precedence

Precedences determine the parsing of complex expressions, especially unbracketed expressions with more than one infix operator. For example,

3 + 4 * 5

parses as 3 + (4 * 5) rather than (3 + 4) * 5 because the relative precedences dictate that * is to be parsed before +. Every operator in the CLEM language has a precedence value associated with it; the smaller this value, the more important it is on the parsing list, meaning that it will be processed sooner than other operators with larger precedence values.