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<span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a> > medfilt1</span>
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<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>
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