From the Sampling Options screen or the Error
Analysis Sampling Options screen, select Latin Hypercube from the Technique list.
Enter the Number of Points that you want to study.
For each defined factor, the levels are defined by uniformly distributing
this number of points between the specified lower and upper values. These
levels are randomly combined with other factor levels to define each
design point to execute.
Select Use a fixed seed to manually specify the
seed in the corresponding text box. If this option is not selected, Isight
determines the seed randomly. Note:
A fixed seed can also be set and used for the entire
model. If a fixed seed is set for the model and also defined separately
in the DOE component, Isight
uses the one defined in the DOE component. If a fixed seed is set for
the model and this option is not selected, the sequence
of random numbers is based on the model’s random seed (and, thus, is
still reproducible). For information about setting a fixed seed, see
the Setting Model Properties.
Select Execute design points in parallel if you
want to execute all the design points defined by the design matrix for
execution simultaneously.
You can use this option only if you are using a multiple CPU system
or if you are connected to a SIMULIA Execution Engine.
Click Next.
The DOE Factor Attributes screen appears.
If desired, change any of the values for the factor:
| Option |
Description |
|---|
| # Levels |
The number of levels at which you want
to study the factors. A change to this attribute automatically readjusts
the levels for this factor. |
| Levels |
A space-separated list of the levels
at which to study the factor. The related attributes are updated once
you click in a different cell. |
| Lower/Upper |
The lower/upper levels for the factor.
A change to one of these attributes automatically calculates new levels
evenly distributed between the lower and upper values. |
| Relation |
Specifies whether the levels are interpreted
as values or as %/difference (diff) from a specified
baseline. |
| Baseline |
The value used for converting levels
into values when the relation is % or diff. |
Click Update factor baselines to current values when executing
if you want the baseline values updated to the current parameter values
before executing. If Isight
previously modified a parameter, this option allows for automatic updating
of the baseline of all factors to the current parameter values in Isight,
prior to executing the DOE technique, which will readjust the values
to be studied appropriately. By default, this option is not selected
and the user-defined settings are retained. This option is useful if
the DOE technique is executed after another element of the simulation
process flow that might change the parameter values (e.g., after an Optimization
component), so that the DOE study can be performed around the new design
point. Click Next. The DOE Design Matrix screen appears. This screen displays the design matrix generated for the specified
technique and the factors selected and attributes specified. Click in the Show list to
select how you want the design matrix displayed:
| Option |
Description |
|---|
| Values |
The actual values to be set at execution. |
| Levels |
The level number as generated by the
technique algorithm. |
Perform any of the following actions to manipulate the design matrix:
| Option |
Description |
|---|
| Deactivate a single design point |
To deactivate
a design point so that it is not executed (the  icon appears), click any row number. You
can also click the  button at the top of the design matrix, or right-click
the design matrix and select Skip selected design point(s). |
| Deactivate all design points |
To deactivate all
design points in the design matrix, highlight all the design points and
click the button. You can also right-click the design matrix and
select Skip all design points. Note:
Deactivating design points is useful when it is known
that a specific set of values in the design matrix represents a design
that cannot be evaluated for whatever reason.
|
| Activate a design point |
To activate a design
point that has been set to be skipped, click the icon that represents the design point.
The row number reappears. You can also click the  button at the top of the design matrix, or right-click
the design point and select Activate selected design point(s). |
| Activate all design points |
To activate all the
design points in the design matrix, highlight all the design points and
click the button. You can also right-click the design matrix and
select Activate all design points. |
| Add user-defined points to the matrix |
To add
any design point to the design matrix, enter a value for each factor
into the empty last row in the table. Typically, the selected DOE technique
generates a matrix based on the options and factors selected, but you
can add any design points to the matrix. The DOE component will fail
to execute if any user-defined point does not have a value for all factors
(the cells with missing values for user-defined points are highlighted
in pink). |
| Paste user-defined points from the clipboard |
To add a set of points
that are already defined in a file, you can copy and paste them directly
into the design matrix as new user-defined by right-clicking and selecting
Paste new user-defined points. Pasting new user-defined
points will always append the points to the matrix (regardless of whatever
cell was selected). If factor names are found in the first row of the
copied data, Isight
uses those names to identify the appropriate columns of data; otherwise;
values are pasted in the same order as they exist in the pasted content.
You must confirm that the values pasted are appropriate for the factors
in those columns. |
| Remove user-defined points from the matrix |
To remove any user-defined
points from the matrix, clear the values from all cells in that row or
right-click and select Remove selected user-defined point(s)
or Remove all user-defined points. |
| Copy the design matrix |
To copy the design matrix
to the clipboard so that it can be pasted elsewhere (e.g., in a text
file), click the Copy  button above the design matrix or right-click the design
matrix and select Copy design matrix. |
| Save the design matrix |
To save the design matrix
to a file, click the Save  button above the design matrix or right-click the design
matrix and select Save. |
|