Entering Table Data

Two-column data tables are used in specifying several input quantities.

When time is the independent variable, if the simulation time is outside of the bounds of the table times, HELIOS assumes a value of zero for the quantity (no extrapolation is performed).

When entering initial conditions for Spatial Regions, the minimum position in the table should be 0, and the maximum position should be equal to the Region Thickness (extrapolation is not supported).

One-column tables are used for specifying

• Zone boundaries
• Frequency group boundaries for radiation transport.

Tables can be populated by any of the following approaches:

• Entering data directly into the table
• Reading in data from a multi-column file
• Setting "x"-column values for linear or logarithmic grids
• Setting "y"-column values using analytic expressions - two column tables only

Menus

To import data from a multi-column ascii file, select File | Import Data. Table data can also be written to a file by selecting File | Export Data.

The Edit menu provides capability for:

• Inserting and deleting rows
• Copying, pasting, and clearing selected portions of the table
• Clearing the entire table

The data in a two column table can also be plotted using Plot | Table data. An example plot is shown below.

Buttons

A grid of "X" (e.g., time or position) values can be conveniently set up via the Set X Grid button. Using this, a grid of either linearly or logarithmically spaced values are added to the table.

"Y" values can be specified using analytic expressions. The expression operates on x-values currently in the table. The analytic expression can be applied to the entire grid or a portion of it by specifying a range for the x-values.

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