Sum

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4D v18

Sum


Sum ( series {; attributePath} ) -> Function result

Parameter	Type	Description
series	Field, Array	Data for which to return the sum
attributePath	Text	Path of attribute for which to return the sum
Function result	Real	Sum for series

Description

The Sum command returns the sum (total of all values) for series. If series is an indexed field, the index is used to total the values.

You can pass an array (one or two dimensions) in series. In this case, the array must be of the Integer, Longint or Real type.

This command accepts an optional attributePath parameter of the Text type, that you can use if series is an object field. It allows you to define the path of the attribute to compute. Use the standard dot notation to define paths to nested attributes, for example "company.address.number". Keep in mind that object attribute names are case-sensitive.
Only numeric attribute values are computed. If there are values in the attribute path which are not of a numeric type, they are ignored.

If the command is correctly executed, the OK system variable is set to 1. If it is interrupted (for example if the user clicks on the Stop button of the progress thermometer), the OK variable is set to 0.

Example 1

The following example is an object method for a vTotal variable placed in a form. The object method assigns the sum of all salaries to vTotal:

vTotal:=Sum([Employees]Salary)

The following method is called to print the records in the selection and to activate break processing:

 ALL RECORDS([Employees])

 ORDER BY([Employees];[Employees]LastNm;>)

 BREAK LEVEL(1)

 ACCUMULATE([Employees]Salary)

 OUTPUT FORM([Employees];"PrintForm")

 PRINT SELECTION([Employees])

Note: The parameter to the BREAK LEVEL command should be equal to the number of breaks in your report. For more information about break processing, refer to the printing commands.

Example 2

This example gets the sum of all the values placed in an array:

 ARRAY REAL($ArrGrades;0)

 QUERY([Exams];[Exams]Exam_Date=!01/07/11!)

 SELECTION TO ARRAY([Exams]Exam_Grade;$ArrGrades)

 vSum:=Sum($ArrGrades)

Example 3

For an example of computing an object field attribute, please refer to the example 3 of the Average command description.