AttributeRounder

Categories

Calculated Values

Strings

Related Transformers

CoordinateRounder

DateTimeRounder

RasterCellValueRounder

Rounds off attributes with numeric values to the specified number of decimal places. Rounding may be nearest, up, or down.

Jump to Configuration

Typical Uses

  • Rounding off numeric attribute values for presentation or consistency.

How does it work?

The AttributeRounder accepts any feature. It rounds the selected attribute(s) to the specified number of decimal places, which may be a fixed integer, or set to an attribute or parameter value.

The newly rounded values replace the original values, and all features are output.

Non-numeric values will be passed through unaltered. If rounding is attempted with Decimal Places set to a non-integer value, the features will be Rejected.

Negative Decimal Place integer values may be used to perform rounding to the left of the decimal, rounding to 10s, 100s, 1000s, and so forth.

Examples

In this example, a spreadsheet containing values will be rounded to 2 decimal places. The source data is not clean, containing one alphanumeric string mixed in with an assortment of numbers.

The features are routed into an AttributeRounder.

In the parameters dialog, we select attribute A for rounding (column A from the spreadsheet), and set the number of Decimal Places to 2. The Round-off Direction is left as Nearest, which rounds up or down as appropriate.

The values are rounded where possible, and replace the original attribute values. Note that numbers that had less than 2 decimal places to start with are not zero-padded, and the non-numeric string “Dogs” has been passed through unaltered.

Configuration

Input Ports

Features with attributes to be rounded.

Output Ports

All processed features are output through this port, whether rounding has been performed or not.

The dynamic <Rejected> port appears when a parameter is set to a non-literal value that might make processing impossible.

For example, if a numeric parameter such as Line Width, Count Start, or Decimal Places is set to an expression, attribute value, or user parameter, it is possible to pass in a non-numeric value that cannot be used. Decimal Places = Cat cannot be processed, so the feature will be output via this port.

Rejected features will have an fme_rejection_code attribute explaining the reason for rejection.

Rejected Feature Handling: can be set to either terminate the translation or continue running when it encounters a rejected feature. This setting is available both as a default FME option and as a workspace parameter.

Parameters

Attributes to Round

Select the source attribute(s) to round.

Decimal Places

Enter a number or take the value of a feature attribute by selecting the attribute name from the pull-down list.

If the Decimal Places value is a negative integer then the integral part of the number will be rounded. For example, if the number is 12345.1234 and the decimal places value is -2, then the rounded value will be 12300.0.

If the number to be rounded is a decimal value, and the Decimal Places value is not 0, then the rounded number will be a decimal value, possibly ending with .0. When the decimal places value is 0, the rounded number will always be an integer.

If the Decimal Places value is not an integer, features will be output via the <Rejected> port.

Round-off Direction

This parameter controls how the rounding will take place.

  • Nearest: the number is rounded up or down to nearest value
  • Up: the number will always be rounded up
  • Down: the number will always be rounded down

Editing Transformer Parameters

Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click beside the applicable parameter. For more information, see Transformer Parameter Menu Options.

Defining Values

There are several ways to define a value for use in a Transformer. The simplest is to simply type in a value or string, which can include functions of various types such as attribute references, math and string functions, and workspace parameters. There are a number of tools and shortcuts that can assist in constructing values, generally available from the drop-down context menu adjacent to the value field.

Using the Text Editor

The Text Editor provides a convenient way to construct text strings (including regular expressions) from various data sources, such as attributes, parameters, and constants, where the result is used directly inside a parameter.

Text Editor

Using the Arithmetic Editor

The Arithmetic Editor provides a convenient way to construct math expressions from various data sources, such as attributes, parameters, and feature functions, where the result is used directly inside a parameter.

Arithmetic Editor

Conditional Values

Set values depending on one or more test conditions that either pass or fail.

Parameter Condition Definition Dialog

Content

Expressions and strings can include a number of functions, characters, parameters, and more.

When setting values - whether entered directly in a parameter or constructed using one of the editors - strings and expressions containing String, Math, Date/Time or FME Feature Functions will have those functions evaluated. Therefore, the names of these functions (in the form @<function_name>) should not be used as literal string values.

String Functions

These functions manipulate and format strings.

Special Characters

 A set of control characters is available in the Text Editor.

Math Functions

Math functions are available in both editors.
Date/Time Functions Date and time functions are available in the Text Editor.

Math Operators

These operators are available in the Arithmetic Editor.

FME Feature Functions

These return primarily feature-specific values.

FME Parameters

FME and workspace-specific parameters may be used.
Creating and Modifying User Parameters Create your own editable parameters.

Dialog Options - Tables

Transformers with table-style parameters have additional tools for populating and manipulating values.

Row Reordering

Enabled once you have clicked on a row item. Choices include:

  • Add a row
  • Remove a row
  • Move current row up one
  • Move current row down one
  • Move current row to top
  • Move current row to bottom

Cut, Copy, and Paste

Enabled once you have clicked on a row item. Choices include:

  • Cut a row - delete and copy to clipboard
  • Copy a row to the clipboard
  • Paste a row from the clipboard

Cut, copy, and paste may be used within a transformer, or between transformers.

Filter

Start typing a string, and the matrix will only display rows matching those characters. Searches all columns. This only affects the display of attributes within the transformer - it does not alter which attributes are output.

Import

Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers.

Reset/Refresh

Generally resets the table to its initial state, and may provide additional options to remove invalid entries. Behavior varies between transformers.

Note: Not all tools are available in all transformers.

Reference

Processing Behavior

Feature-Based

Feature Holding

No
Dependencies  
Aliases  
History  

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Examples may contain information licensed under the Open Government Licence – Vancouver and/or the Open Government Licence – Canada.