source: orange/docs/widgets/rst/data/selectattributes.rst @ 11359:8d54e79aa135

Revision 11359:8d54e79aa135, 1.7 KB checked in by Ales Erjavec <ales.erjavec@…>, 14 months ago (diff)

Cleanup of 'Widget catalog' documentation.

Fixed rst text formating, replaced dead hardcoded reference links (now using
:ref:), etc.

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1.. _Select Attributes:
2
3Select Attributes
4=================
5
6.. image:: images/SelectAttributes_icon.png
7   :alt: Select Attributes icon
8
9Signals
10-------
11
12Input:
13  - Examples (ExampleTable)
14      Attribute-valued data set.
15
16Outputs:
17  - Examples (ExampleTable)
18      Attribute-valued data set composed using the domain
19      specification constructed using the widget.
20
21Description
22-----------
23
24Select Attributes widget is used to manually compose your data
25domain, that is, to decide which attributes will be used and how.
26Orange distinguishes between ordinary attributes, an (optional) class
27attributes and meta attributes. For instance, for building a classification
28model, the domain would be composed of a set of attributes and a discrete class
29attribute. Meta attributes are not used in modelling, but several widgets can
30use them  for providing optional labels to instances.
31
32Orange attributes are typed and are either discrete, continuous or
33a character string. The attribute type is marked with a symbol appearing
34before the name of the attribute (D, C, S, respectively).
35
36Changes made to the domain are propagated to the output by pressing an
37Apply button. Reset will present the attributes as defined in original
38domain in the data set from the input signal
39
40.. image:: images/SelectAttributes.png
41   :alt: Select Attributes widget example
42
43Examples
44--------
45
46Below is a simple example how to use this widget. The input is fed directly
47from  the :ref:`File` widget, and the output to the :ref:`Data Table` widget.
48We have also linked the former to the File widget so that one can inspect the
49difference in the domain composition.
50
51.. image:: images/SelectAttributes_schema.png
52   :alt: Select Attributes schema
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