IBM Visualization Data Explorer User's Reference

Compute2

Category

Transformation

Function

Evaluates an expression on each data point in a specified field or value list.

Syntax

output = Compute2(expression, name, input, ...);

Inputs

Name	Type	Default	Description
expression	string	none	expression(s) to be computed
name	string	no default	name of input that follows (defaults to "a")
input	field or value list	no default	input value
name1	string	no default	name of input that follows (defaults to "b")
input1	field or value list	no default	input value
...	...	...	...

Outputs

Name	Type	Description
output	field, value, or value list	output values

Functional Details

The primary advantage of this alternative form of Compute is that, in the user interface, expression is an input that can be provided by another tool (e.g., a selector interactor). All the functions of Compute (see Compute) are also functions of Compute2.

expression	is a mathematical expression to be evaluated for a set of input values. Table 1 lists the operators. This parameter is followed by one or more name-input pairs.
name	is name of the variable in the expression to be evaluated.
input	is the input to which expression is applied. If there are more than one, the input fields must be isomorphic (i.e., their hierarchies must match exactly).

A single Compute2 module can operate on a maximum of 21 input values. The default number of enabled input tabs is two. (Tabs can be added to the module icon and removed with the appropriate Input/Output Tabs options in the Edit pull-down menu of the VPE.)

Example Visual Programs

ComputeMultiLine.net
SIMPLE/Compute2.net

See Also

 Compute

[Data Explorer Home Page | Contact Data Explorer | Same document on Data Explorer Home Page ]