Controlling Table Extrapolation Regions

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What Are Regions? Defining a Region Clearing a Region

What Are Regions?

A region is an area that defines locally where to extrapolate before globally extrapolating over the entire table.

For example, consider filling a large table that has twenty breakpoints for each normalizer by extrapolation. Two problems arise:

• To have meaningful results, you need to set values at a large number of operating points.

• To set values at a large number of operating points takes a long time.

To overcome this problem, you can

1. Define regions within the lookup table.

2. In each region, set the values of some operating points.

3. Click to fill the table by extrapolation.

Each region is filled by extrapolation in turn. Then the rest of the table is filled by extrapolation. The advantage of using regions is that you can have more meaningful results by setting values for a smaller number of operating points.

Cells are colored

• Yellow if they form part of the extrapolation mask

• Blue if they are part of a region

• Yellow and blue with rounded corners if they are part of the extrapolation mask and part of a region

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Defining a Region

1. Click and drag to highlight the rectangle of cells in your table.

2. To define the region, click in the toolbar, or right-click and select Extrapolation Regions > Add Selection, or select the menu option Tables > Extrapolation Regions > Add Selection.

The cells in the region are colored blue.

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Clearing a Region

1. Highlight the rectangle of cells in your table.

2. To clear the region, click in the toolbar, or right-click and select Extrapolation Regions > Remove Selection, or select the menu option Tables > Extrapolation Regions > Remove Selection.

   You can clear all regions at once by selecting Clear Regions from the Extrapolation Regions submenu.

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Choosing a Table Value at a Specific Operating Point

Point-by-Point Model Tradeoffs

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