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Lookup Table Glossary

The following table summarizes the terminology used to describe lookup tables in the Simulink® user interface and documentation.

TermMeaning

breakpoint

A single element of a breakpoint data set. A breakpoint represents a particular input value to which a corresponding output value in the table data is mapped.

breakpoint data set

A vector of input values that indexes a particular dimension of a lookup table. A lookup table uses breakpoint data sets to relate its input values to the output values that it returns.

extrapolation

A process for estimating values that lie beyond the range of known data points.

interpolation

A process for estimating values that lie between known data points.

lookup table

An array of data that maps input values to output values, thereby approximating a mathematical function. Given a set of input values, a "lookup" operation retrieves the corresponding output values from the table. If the lookup table does not explicitly define the input values, Simulink can estimate an output value using interpolation, extrapolation, or rounding.

monotonically increasing

The elements of a set are ordered such that each successive element is greater than or equal to its preceding element.

rounding

A process for approximating a value by altering its digits according to a known rule.

strictly monotonically increasing

The elements of a set are ordered such that each successive element is greater than its preceding element.

table data

An array that serves as a sampled representation of a function evaluated at a lookup table's breakpoint values. A lookup table uses breakpoint data sets to index the table data, ultimately returning an output value.

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