blob: c909f73c6567f16458529cbb51bce3f46ac003d6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>medfilt1</title>
<style type="text/css" media="all">
@import url("scilab_code.css");
@import url("xml_code.css");
@import url("c_code.css");
@import url("style.css");
</style>
</head>
<body>
<div class="manualnavbar">
<table width="100%"><tr>
<td width="30%">
<span class="previous"><a href="marcumq.html"><< marcumq</a></span>
</td>
<td width="40%" class="center">
<<<<<<< HEAD
<span class="top"><a href="section_5118e822ecc2888aa80042108de4932e.html">FOSSEE Signal Processing Toolbox</a></span>
=======
<span class="top"><a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a></span>
>>>>>>> 3f916032cc0b2efdeafb838dd10e1141ead2cb27
</td>
<td width="30%" class="next">
<span class="next"><a href="mexihat.html">mexihat >></a></span>
</td>
</tr></table>
<hr />
</div>
<<<<<<< HEAD
<span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_5118e822ecc2888aa80042108de4932e.html">FOSSEE Signal Processing Toolbox</a> > medfilt1</span>
=======
<span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a> > medfilt1</span>
>>>>>>> 3f916032cc0b2efdeafb838dd10e1141ead2cb27
<br /><br />
<div class="refnamediv"><h1 class="refname">medfilt1</h1>
<p class="refpurpose">1D median filtering</p></div>
<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3>
<div class="synopsis"><pre></pre></div></div>
<div class="refsection"><h3 class="title">Description</h3>
<p class="para">y = medfilt1(x)
Applies a 3rd order 1-dimensional median filter to input x along the
first non-zero dimension. The function appropriately pads the signal
with zeros at the endings. For a segment, a median is calculated as
the middle value (average of two middle values) for odd number
number (even number) of data points.
y = medfilt1(x,n)
Applies a nth order 1-dimensional median filter.
y = medfilt1(x,n,dim)
Applies the median filter along the n-th dimension
y = medfilt1(__, nanflag, padding)
nanflag specifies how NaN values are treated. padding specifies the
type of filtering to be performed at the signal edges.</p>
<p class="para"></p></div>
<div class="refsection"><h3 class="title">Parameters</h3>
<dl><dt><span class="term">x:</span>
<dd><p class="para">int | double</p></dd></dt>
<dt><span class="term">n:</span>
<dd><p class="para">positive integer scalar</p></dd></dt>
<dt><span class="term">dim:</span>
<dd><p class="para">positive integer scalar</p></dd></dt>
<dt><span class="term">nanflag:</span>
<dd><p class="para">'includenan' (default) | 'omitnan'</p></dd></dt>
<dt><span class="term">* includenan:</span>
<dd><p class="para">Filtering such that the median of any segment</p></dd></dt>
<dt><span class="term">* omitnan:</span>
<dd><p class="para">Filtering with NaNs omitted in each segment. If a segment</p></dd></dt>
<dt><span class="term">y:</span>
<dd><p class="para">int | double</p></dd></dt></dl></div>
<div class="refsection"><h3 class="title">Examples</h3>
<div class="programlisting"><table border="0" width="100%"><tr><td width="98%"><pre class="scilabcode"><span class="scilabnumber">1</span><span class="scilabopenclose">)</span> <span class="scilabid">Noise</span> <span class="scilabid">supression</span> <span class="scilabid">using</span> <a class="scilabmacro" href="scilab://median">median</a> <span class="scilabstring">filtering</span>
<span class="scilabid">fs</span> <span class="scilaboperator">=</span> <span class="scilabnumber">1e3</span><span class="scilabdefault">;</span>
<span class="scilabid">t</span> <span class="scilaboperator">=</span> <span class="scilabnumber">1</span><span class="scilabspecial">:</span><span class="scilabnumber">1</span><span class="scilaboperator">/</span><span class="scilabid">fs</span><span class="scilabspecial">:</span><span class="scilabnumber">1</span><span class="scilabdefault">;</span>
<span class="scilabid">s</span> <span class="scilaboperator">=</span> <a class="scilabcommand" href="scilab://sin">sin</a><span class="scilabopenclose">(</span><span class="scilabnumber">2</span><span class="scilaboperator">*</span><span class="scilabconstants">%pi</span><span class="scilaboperator">*</span><span class="scilabnumber">2</span><span class="scilaboperator">*</span><span class="scilabid">t</span><span class="scilabopenclose">)</span><span class="scilaboperator">+</span> <a class="scilabcommand" href="scilab://cos">cos</a><span class="scilabopenclose">(</span><span class="scilabnumber">2</span><span class="scilaboperator">*</span><span class="scilabconstants">%pi</span><span class="scilaboperator">*</span><span class="scilabnumber">5</span><span class="scilaboperator">*</span><span class="scilabid">t</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span>
<span class="scilabcomment">// Adding noise</span>
<span class="scilabid">x</span> <span class="scilaboperator">=</span> <span class="scilabid">s</span> <span class="scilaboperator">+</span> <span class="scilabnumber">0.1</span><span class="scilaboperator">*</span><span class="scilabid">randn</span><span class="scilabopenclose">(</span><a class="scilabcommand" href="scilab://size">size</a><span class="scilabopenclose">(</span><span class="scilabid">s</span><span class="scilabopenclose">)</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span>
<span class="scilabid">y</span> <span class="scilaboperator">=</span> <span class="scilabid">medfilt1</span><span class="scilabopenclose">(</span><span class="scilabid">x</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span></pre></td><td valign="top"><a href="scilab://scilab.execexample/"><img src="ScilabExecute.png" border="0"/></a></td><td valign="top"><a href="scilab://scilab.editexample/"><img src="ScilabEdit.png" border="0"/></a></td><td></td></tr></table></div></div>
<div class="refsection"><h3 class="title">See also</h3>
<ul class="itemizedlist"><li class="member"><a href="scilab://filter" class="link">| hampel | median | sgolayfilt</a></li></ul></div>
<div class="refsection"><h3 class="title">Authors</h3>
<ul class="itemizedlist"><li class="member">Ayush Baid</li></ul></div>
<br />
<div class="manualnavbar">
<table width="100%">
<tr><td colspan="3" class="next"><a href="http://bugzilla.scilab.org/enter_bug.cgi?product=Scilab%20software&component=Documentation%20pages" class="ulink">Report an issue</a></td></tr>
<tr>
<td width="30%">
<span class="previous"><a href="marcumq.html"><< marcumq</a></span>
</td>
<td width="40%" class="center">
<<<<<<< HEAD
<span class="top"><a href="section_5118e822ecc2888aa80042108de4932e.html">FOSSEE Signal Processing Toolbox</a></span>
=======
<span class="top"><a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a></span>
>>>>>>> 3f916032cc0b2efdeafb838dd10e1141ead2cb27
</td>
<td width="30%" class="next">
<span class="next"><a href="mexihat.html">mexihat >></a></span>
</td>
</tr></table>
<hr />
</div>
</body>
</html>
|
