User`s guide

2 Importing, Viewing, and Preprocessing Data
2-30
Sectioning
Sectioning involves specifying a range of response data or a range of predictor
data to exclude. You might want to section a data set because different parts of
the data set are described by different models or many contiguous data points
are corrupted by noise, large systematic errors, and so on.
Sectioning data with the Curve Fitting Toolbox follows these rules:
• If you are only sectioning data and not excluding individual data points, then
you can create an exclusion rule without specifying a data set name.
Note that you can associate the exclusion rule with any data set provided
that the range or domain of the exclusion rule overlaps with the range or
domain of the data set. This is useful if you have multiple data sets from
which you want to exclude data points using the same range or domain.
• Using the Exclude GUI, you specify a range or domain of data to include. The
excluded data lies outside this specification.
Additionally, you can specify only a single range, domain, or box (range and
domain) of included data points. Therefore, at most, you can define two
vertical strips, two horizontal strips, or a border of excluded data. Refer to
“Example: Excluding and Sectioning Data” on page 2-32 for an example.
To exclude multiple sections of data, you can use the
excludedata function
from the MATLAB command line.