source: orange/docs/widgets/rst/data/selectattributes.rst @ 11050:e3c4699ca155

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1.. _Select Attributes:
2
3Select Attributes
4=================
5
6.. image:: ../../../../Orange/OrangeWidgets/Data/icons/SelectAttributes_48.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 attributes
27and meta attributes. For instance, for building a classification model, the
28domain would be composed of a set of attributes and a discrete class attribute.
29Meta attributes are not used in modelling, but several widgets can use them
30for 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--------
45Below is a simple example how to use this widget. The input is fed directly from
46the :ref:`File` widget, and the output to the :ref:`Data Table` widget. We have also linked
47the former to the File widget so that one can inspect the difference in the
48domain composition.
49
50.. image:: images/SelectAttributes_schema.*
51   :alt: Select Attributes schema
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