An Attribute expression is a mathematical combination of attributes in the database,
representing a performance index or a user-defined attribute (for example, specific strength
(yield strength/density)). You can plot an Attribute expression on a chart axis to compare
two complex requirements on one selection chart.
Prerequisites: Attribute expressions are added to Chart Stages. For more information, see Creating a chart stage.
-
In the Chart Settings, select the axis to plot the
Attribute expression on, and click Advanced.
-
Enter the expression to use.
Note: Only numerical attributes, constants, and parameters can be combined in an
expression.
You can build an attribute expression by adding attributes, logarithms,
constants or parameters, and record branches:
| Option | Description |
|---|
| Attribute |
Attributes are listed on the Attributes tab,
select the Attributes you want to add to your expression and click
Insert. |
| Logarithm |
- For a logarithm with base 10, type log()
into the top pane, and insert the attribute inside the
parentheses. For example,
log([Density]).
- For a logarithm with base e, type ln(),
and insert the attribute inside the parentheses. For example,
ln([Density]).
|
| Record branches |
On the Trees tab, navigate to the type of
record to include and click Insert. |
| Constant or a Parameter |
On the Constants/Parameters tab, select
Constants or Parameters,
choose an item and click Insert. |
