source: orange/orange/doc/widgets/Data/SelectAttributes.htm @ 9399:6bbe263e8bcf

Revision 9399:6bbe263e8bcf, 2.2 KB checked in by mitar, 2 years ago (diff)

Renaming widgets catalog.

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1<html>
2<head>
3<title>Select Attributes</title>
4<link rel=stylesheet href="../../../style.css" type="text/css" media=screen>
5<link rel=stylesheet href="style-print.css" type="text/css" media=print></link>
6</head>
7
8<body>
9
10<h1>Select Attributes</h1>
11
12<img class="screenshot" src="../icons/SelectAttributes.png">
13<p>Manual selection of attributes and composition of data domain.</p>
14
15<h2>Channels</h2>
16
17<h3>Inputs</h3>
18
19<DL class=attributes>
20<DT>Examples (ExampleTable)</DT>
21<DD>Attribute-valued data set.</DD>
22</dl>
23
24<h3>Outputs</h3>
25
26<DL class=attributes>
27<DT>Examples (ExampleTable)</DT>
28<DD>Attribute-valued data set composed using the domain specification
29constructed using the widget.</DD>
30</dl>
31
32<h2>Description</h2>
33
34<p>Select Attributes widget is used to manually compose your data
35domain, that is, to decide which attributes will be used and
36how. Orange distinguishes between ordinary attributes, an (optional)
37class attributes and meta attributes. For instance, for building a
38classification model, the domain would be composed of a set of
39attributes and a discrete class attribute. Meta attributes are not
40used in modelling, but several widgets can use them for providing
41optional labels to instances.</p>
42
43<p>Orange attributes are typed and are either discrete, continuous or
44a character string. The attribute type is marked with a symbol
45appearing before the name of the attribute (D, C, S,
46respectively).</p>
47
48<p>Changes made to the domain are propagated to the output by pressing an <span class="option">Apply</span> button. <span class="option">Reset</span> will present
49the attributes as defined in original domain in the data set from the
50input signal</p>
51
52<img class="screenshot" src="SelectAttributes.png" alt="Select Attributes" border=0>
53
54<h2>Examples</h2>
55
56<p>Below is a simple example how to use this widget. The input is fed
57directly from the <a href="File.htm">File</a> widget, and the output
58to the <a href="DataTable.htm">Data Table</a> widget. We have also
59linked the former to the File widget so that one can inspect the
60difference in the domain composition.</p>
61
62<img
63src="SelectAttributes-Example1.png" alt="Schema with Select
64Attributes" class="schema">
65
66</body>
67</html>
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