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<table width="100%" summary="page for gcrcrec {Rwave}"><tr><td>gcrcrec {Rwave}</td><td align="right">R Documentation</td></tr></table>
<h2>Crazy Climbers Reconstruction by Penalization</h2>
<h3>Description</h3>
<p>
Reconstructs a real valued signal from ridges found by
crazy climbers on a gabor transform.
</p>
<h3>Usage</h3>
<pre>
gcrcrec(siginput, inputgt, beemap, nvoice, freqstep, scale, compr,
bstep=5, ptile=0.01, epsilon=0, fast=TRUE, para=5, minnbnodes=3,
hflag=FALSE, real=FALSE, plot=2)
</pre>
<h3>Arguments</h3>
<table summary="R argblock">
<tr valign="top"><td><code>siginput</code></td>
<td>
original signal.
</td></tr>
<tr valign="top"><td><code>inputgt</code></td>
<td>
Gabor transform.
</td></tr>
<tr valign="top"><td><code>beemap</code></td>
<td>
occupation measure, output of <code><a href="crc.html">crc</a></code>.
</td></tr>
<tr valign="top"><td><code>nvoice</code></td>
<td>
number of frequencies.
</td></tr>
<tr valign="top"><td><code>freqstep</code></td>
<td>
sampling step for frequency axis.
</td></tr>
<tr valign="top"><td><code>scale</code></td>
<td>
size of windows.
</td></tr>
<tr valign="top"><td><code>compr</code></td>
<td>
compression rate to be applied to the ridges.
</td></tr>
<tr valign="top"><td><code>bstep</code></td>
<td>
size (in the time direction) of the steps for chaining.
</td></tr>
<tr valign="top"><td><code>ptile</code></td>
<td>
threshold of ridge
</td></tr>
<tr valign="top"><td><code>epsilon</code></td>
<td>
constant in front of the smoothness term in penalty function.
</td></tr>
<tr valign="top"><td><code>fast</code></td>
<td>
if set to TRUE, uses trapezoidal rule to evaluate <i>Q_2</i>.
</td></tr>
<tr valign="top"><td><code>para</code></td>
<td>
scale parameter for extrapolating the ridges.
</td></tr>
<tr valign="top"><td><code>minnbnodes</code></td>
<td>
minimal number of points per ridge.
</td></tr>
<tr valign="top"><td><code>hflag</code></td>
<td>
if set to FALSE, uses the identity as first term
in the kernel. If not, uses <i>Q_1</i> instead.
</td></tr>
<tr valign="top"><td><code>real</code></td>
<td>
if set to TRUE, uses only real constraints.
</td></tr>
<tr valign="top"><td><code>plot</code></td>
<td>
<dt>1</dt><dd>displays signal,components, and reconstruction one after another.
</dd>
<dt>2</dt><dd>displays signal, components and reconstruction.
</dd></td></tr>
</table>
<h3>Details</h3>
<p>
When ptile is high, boundary effects may appeare.
para controls extrapolation of the ridge.
</p>
<h3>Value</h3>
<p>
Returns a structure containing the following elements:
</p>
<table summary="R argblock">
<tr valign="top"><td><code>rec</code></td>
<td>
reconstructed signal.
</td></tr>
<tr valign="top"><td><code>ordered</code></td>
<td>
image of the ridges (with different colors).
</td></tr>
<tr valign="top"><td><code>comp</code></td>
<td>
2D array containing the signals reconstructed from ridges.
</td></tr>
</table>
<h3>References</h3>
<p>
See discussions in the text of ``Practical Time-Frequency Analysis''.
</p>
<h3>See Also</h3>
<p>
<code><a href="crc.html">crc</a></code>, <code><a href="cfamily.html">cfamily</a></code>, <code><a href="crcrec.html">crcrec</a></code>,
<code><a href="scrcrec.html">scrcrec</a></code>.
</p>
<hr><div align="center">[Package <em>Rwave</em> version 1.24 <a href="00Index.html">Index]</a></div>
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