Page 859 - Mechatronics with Experiments

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MATLAB , SIMULINK , STATEFLOW, AND AUTO-CODE GENERATION 845
AND <=

y3
2-D T(u)
x
y2 f
y y1
Lookup Lookup x Lookup
table (1-D) table (2-D) table (n-D)

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FIGURE A.19: Simulink blocks for logical operators (i.e., AND), relational operators
(comparator i.e., <=), and look-up tables.

The relational operator property can be set to

== , = , > , < , >= , <=
Look-up tables and data interpolation based on a table are commonly used in control appli-
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cations. Simulink provides one-dimensional (i.e., f(x)), two-dimensional (i.e. f(x, y)), and
multi-dimensional look-up tables that can be used for interpolation. A single dimensional
table is simply two data vectors: row-vector (independent variable values, x), and the cor-
responding function (f(x)) values with the same dimension. Two-dimensional tables have
two variables: row-vector (i.e., 1xm ) and column-vector (i.e., 1xn), then the table must
be a matrix of dimension mxn. The row-vector variable is connected to the x-port and the
column vector variable is connected to the y-port of the 2D look-up table interpolator. The