Using Dataset Expressions

Dataset expressions take the following form:

$ds1((x₀,y₀), ..., (x_n,y_n))

These expressions may be used as the first parameter to piecewise linear (pwl, pwlx and pwl_periodic) functions, and may also be assigned to variables, in which case the variable may be used as the second parameter to pwl, pwlx and pwl_periodic functions.

Dataset expressions are derived from a series of points in a plot created in the Datasets window. (Refer to Adding Datasets for related information on working with datasets.) Each plot consists of straight line segments whose vertices represent their end points. A curve is fitted to the segments of the plot, and an expression is derived from the curve that best fits the segmented plot. The created expression is then used in the piecewise linear intrinsic functions.

Related Topics 

Adding Datasets

Adding a Design Variable

Modifying Datasets

Using Piecewise Linear Functions in Expressions