Anatomy of a lookup table

The following figure shows the anatomy of a two-dimensional lookup table. Reference point vectors and an array called table data make up the lookup table:

A reference point is a single element of a vector of reference points. A reference point represents a specific input value that is matched to a corresponding output value in the table data. Each anchor point is an index of the input values for a particular dimension of the lookup table. The array of table data serves as a sample representation of the function evaluated against the anchor point values. Lookup table blocks use reference points to relate the input values of the table to the output values it returns.

A vector of anchor points consists of input values that index a particular dimension of the lookup table. A lookup table uses vectors of reference points to associate the input values with the output values it returns.

The table data is an array that serves as a sample representation of the function evaluated against the lookup table’s anchor point values. The lookup table uses the reference points to index the table data and ultimately returns an output value.