IBM Visualization Data Explorer User's Reference

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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


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