Managing Parameters

A Granta MI data schema may define Parameters that can be used in the evaluation of functional data, for example, temperature, mass, or number of cycles.

There are two types of Parameter that are supported:

Numeric

Numeric Parameters may be unrestricted (may be set to any value, interpolation is permitted) or restricted (only a defined set of values is permitted, no interpolation possible).

You can set the following scale and interpolation type options for numeric Parameters:


Scale	Interpolation type	Result
Linear	Linear	Linear
Linear	Cubic spline	Cubic spline
Logarithmic	Linear	Logarithmic
Logarithmic	Cubic spline	Cubic spline on Logarithmic

Discrete Parameters

Discrete Parameters have text values. For example, the

Data
                        Type

Parameter might have values of Test, Minimum, Fitted, Runout and Adjusted Runout.

To access the parameters for a database:

Open Administration > Schema Editor and select the database.
From the Database properties, select Parameters.
The current list of Parameters are listed. If required, you can select Show used in Attributes to list the Attributes that use each Parameter.
To add a Parameter, click Create Parameter.

For both Numeric and Discrete Parameters, fill in the following fields:

Option	Description
Name	A Parameter name may not be blank and it may not contain left square bracket `[`, right square bracket `]` or colon `:` characters. The name must be unique within the database. It is not treated as case-sensitive and so the same name with different cases is not permitted within the same database. When you change the name of an existing Parameter, its name is updated wherever it is used.
Values	One or more values must be specified. Use Set as Default to specify the default value for this Parameter. For numeric Parameters, this specifies the value used for Interpolation or Selection. If no default value is set, the first value in the list is assumed to be the default value.

Option

Description

Name

A Parameter name may not be blank and it may not contain left square bracket [, right square bracket ] or colon : characters. The name must be unique within the database. It is not treated as case-sensitive and so the same name with different cases is not permitted within the same database.

When you change the name of an existing Parameter, its name is updated wherever it is used.

Values

One or more values must be specified. Use Set as Default to specify the default value for this Parameter. For numeric Parameters, this specifies the value used for Interpolation or Selection. If no default value is set, the first value in the list is assumed to be the default value.

In addition, for Numerical Parameters, fill in the following fields:

Option	Description
Unit	The units to be used.
Restrict parameter to these values only (Optional)	Determines whether the Parameter is restricted to the specified values. Numeric unrestricted Parameters can have any value and must be interpolated. Numeric restricted Parameters are restricted to the valued specified, and cannot be interpolated.
Interpolation type	One of: none, Linear, or Cubic spline. By default, Functional Attributes will use the Parameter's interpolation and scale settings unless overridden in the Attribute properties.
Scale	Either Logarithmic or Linear. By default, Functional Attributes will use the Parameter's interpolation and scale settings unless overridden in the Attribute properties.