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  Working with Variables > Defining an Expression       

Using Dataset Expressions

In the simplest sense a dataset is a collection of data. It can take the following form:

$ds1((x0,y0), ..., (xn,yn))

A dataset (such as $ds1) once created may be used as the first parameter to piecewise linear (pwl 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 and pwl_periodic functions.

A dataset is generated using a series of points in a plot on the Datasets dialog box. Each plot consists of straight line segments whose vertices represent their end points. A curve is fitted to the segments of the plot. This curve which best fits the segmented plot consists of the co-ordinates used in the creation of the dataset.

The dataset thus created may be used in the piecewise linear intrinsic functions.

Note

The following example aims to only inform how to perform the task of using a dataset. The values used are arbitrary.

1. Click HFSS> Design Datasets

2. Click Add and set the Name field and Coordinates as desired and click OK.

The dataset is created.

 

Note

By default the $ sign is assigned to the dataset even if you do not use one while naming it.

3. Go to Tools>Edit Configured Libraries>Materials to open the Edit Libraries dialog box.

4. Click Add Material.

5. Type in the piecewise linear function and use the dataset $ds1 as shown in the figure below.

6. Click OK.

Thus the example shows how to make a material property frequency dependent using a dataset as the first parameter to a pwl function.

 

Related Topics

Adding Datasets

Adding a Design Variable

Modifying Datasets

Using Piecewise Linear Functions in Expressions