Calculated fields in data blocks use expressions that specify the operations and functions to be performed, the referenced attribute fields, and any needed value conversion. The tables below show the operations and functions that can be used in expressions of calculated fields.
For defining calculated fields it is assumed that you have some familiarity with scripting.
Operations
The following operations can be used in the expression of a calculation field:
Notation  Operation  Explanation 

+  Add  Adds the operands. If both operands are integer, the result is also integer. Otherwise the result will be real. Example: 
  Subtract  Subtracts the right operand from the left. If both operands are integer, the result is also integer. Otherwise the result will be real. Example: 
*  Multiply  Multiplies the operands. If both operands are integer, the result is also integer. Otherwise the result will be real. Example: 
/  Divide  Divides the left operand by the right. If both operands are integer, the operation will perform integer division and the result is also integer. In all other cases, the operation will be a proper division and the result will be real. Examples:

Functions
The following predefined functions can be used in the expression of a calculated field:
Notation  Function  Explanation 

min  Minimum  Returns the smallest value among its arguments. 
max  Maximum  Returns the largest value among its arguments. 
sum  Sum  Returns the sum of its arguments. 
prod  Product  Returns the product of its arguments. 
avg  Average  Returns the arithmetic average value of its arguments: the sum of the values divided by the number of values. 
geoman  Geometric mean  Returns the geometric mean value of its arguments: the Nth root of the product of the values (with N equal to the number of values). 
sqrt  Square root  Returns the square root of its (single) arguments. 
abs  Absolute value  Returns its (single) argument unchanged if it 
Parentheses and brackets
Notation  Operation  Explanation 

( )  Parentheses  Can be used for specifying the order of operations. Example: 
< >  Angle brackets  Can be used for referencing other attribute fields. Example: 
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