# IBM Visualization Data Explorer User's Reference

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### Construct

Category

Realization

Function

Constructs a field with regular connections.

Syntax

    output = Construct(origin, deltas, counts, data);

Inputs

Name | Type | Default | Description
--- | --- | --- | ---
`origin` | vector list | input dependent | origin for positions or a list of positions
`deltas` | vector list | input dependent | deltas for positions
`counts` | integer or vector | input dependent | number of positions in each dimension
`data` | value list or string list | no default | data, last index varies fastest

Outputs

Name | Type | Description
--- | --- | ---
`output` | field | the output field

Functional Details

This module creates a field by defining its positions and connections.

`origin` | specifies either the origin of a field with regular positions or a list of positions for a field with irregular positions.
`deltas` | should be used only for creating a field with regular connections. It specifies one of the following: a vector of the same shape as `origin`, if `origin` is specified a list of vectors that match `origin`, the number of vectors being equal to the number of dimensions in `origin`. (This specification can be used to define a grid with non-orthogonal axes.) If `origin` is not specified, the dimensionality of the output positions is derived from the dimensionality of `deltas`. The default value is a unit vector.
`counts` | specifies the number of positions in each dimensions for a field with regular connections. The module interprets this parameter according to the value specified by `origin`. If `origin` specifies: a single vector: the field will have regular positions and regular connections. (If `counts` has been specified as a single number, the module creates that number of positions in each dimension.) a vector list: the field will have irregular positions and regular connections. The product of the counts must match the number of positions given by `origin`. To create a field consisting of just the items specified by `origin` as the "positions" component, do not specify `counts`. If the list of vectors contains more than one item, the output has, in addition to the "positions" component containing the points in `origin`, a "connections" component of element type "lines".
`data` | specifies one or more data values associated with the positions or connections of the field. If specified, this parameter must be either a single value or a list of values. If it is a single value or a list with a length that matches the number of positions [e.g., n0×n1..., where n0, n1, ..., are the `counts`], then the output data component is dependent on the "positions" component. If the list has a length that matches the number of connection elements (e.g., (n0-1) × (n1-1) ...), then the output data is dependent on the "connections" component. Any other number of items in `data` is an error. The type of the "data" component is the type of the input `data`. If `data` is a string list, the "data" component will be TYPE_STRING.

Note: If none of the first three parameters is specified (`origin`, `deltas`, or `counts`), Construct creates an empty field.

Components

Creates "positions" and "connections" components. A "data" component is created if `data` is not null.

Example Visual Programs

    AnnotationGlyphs.net
    ConnectingScatteredPoints.net
    ProbeText.net
    Sealevel.net
    UsingColormaps.net
    UsingStreakline.net
    SIMPLE/Construct.net

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