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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"><html><head> <title>Description of shrink</title> <meta name="keywords" content="shrink"> <meta name="description" content="SHRINK - Removes outer zeros of a matrix."> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="generator" content="m2html © 2003 Guillaume Flandin"> <meta name="robots" content="index, follow"> <link type="text/css" rel="stylesheet" href="../m2html.css"></head><body><a name="_top"></a><div><a href="../index.html">Home</a> > <a href="index.html">mri_toolbox</a> > shrink.m</div><!--<table width="100%"><tr><td align="left"><a href="../index.html"><img alt="<" border="0" src="../left.png"> Master index</a></td><td align="right"><a href="index.html">Index for mri_toolbox <img alt=">" border="0" src="../right.png"></a></td></tr></table>--><h1>shrink</h1><h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>SHRINK - Removes outer zeros of a matrix.</strong></div><h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="box"><strong>function [Y, varargout] = shrink(X,E) </strong></div><h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="fragment"><pre class="comment"> SHRINK - Removes outer zeros of a matrix.
Y = SHRINK(X) removes the outer columns/rows/etc (borders) that
contains only zeros on a matrix X. The shrinking goes on untill
the first column/row/etc containing a nonzero element is found
Examples: SHRINK([0 0 1 0 2 3 0]) = [1 0 2 3]
SHRINK([[0 0 0 0 0 0 0] = [[0 0 1 2]
0 0 0 1 2 0 0] [0 0 0 0]
0 0 0 0 0 0 0] [3 0 0 0]]
0 3 0 0 0 0 0]])
Y = SHRINK(X,E) removes columns/rows/etc containing only the
element E, intead of zero.
[Y,Li,Ls] = SHRINK(...) also returns the limits of the shrinking,
Li = inferior limits and Ls = superior limits.
See also <a href="grow.html" class="code" title="function Y = grow(varargin)">GROW</a>, ROLL, PAD, PADC.</pre></div><!-- crossreference --><h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2>This function calls:<ul style="list-style-image:url(../matlabicon.gif)"></ul>This function is called by:<ul style="list-style-image:url(../matlabicon.gif)"></ul><!-- crossreference --><h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../up.png"></a></h2><div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function [Y, varargout] = shrink(X,E)</a>0002 0003 <span class="comment">% SHRINK - Removes outer zeros of a matrix.</span>0004 <span class="comment">%</span>0005 <span class="comment">% Y = SHRINK(X) removes the outer columns/rows/etc (borders) that</span>0006 <span class="comment">% contains only zeros on a matrix X. The shrinking goes on untill</span>0007 <span class="comment">% the first column/row/etc containing a nonzero element is found</span>0008 <span class="comment">%</span>0009 <span class="comment">% Examples: SHRINK([0 0 1 0 2 3 0]) = [1 0 2 3]</span>0010 <span class="comment">%</span>0011 <span class="comment">% SHRINK([[0 0 0 0 0 0 0] = [[0 0 1 2]</span>0012 <span class="comment">% 0 0 0 1 2 0 0] [0 0 0 0]</span>0013 <span class="comment">% 0 0 0 0 0 0 0] [3 0 0 0]]</span>0014 <span class="comment">% 0 3 0 0 0 0 0]])</span>0015 <span class="comment">%</span>0016 <span class="comment">% Y = SHRINK(X,E) removes columns/rows/etc containing only the</span>0017 <span class="comment">% element E, intead of zero.</span>0018 <span class="comment">%</span>0019 <span class="comment">% [Y,Li,Ls] = SHRINK(...) also returns the limits of the shrinking,</span>0020 <span class="comment">% Li = inferior limits and Ls = superior limits.</span>0021 <span class="comment">%</span>0022 <span class="comment">% See also GROW, ROLL, PAD, PADC.</span>0023 <span class="comment">%</span>0024 0025 <span class="keyword">if</span> nargin==10026 E = 0;0027 <span class="keyword">end</span>0028 0029 <span class="comment">% If X is row vector transform to col vector (to prevent problems with find)</span>0030 flagrow = 0;0031 <span class="keyword">if</span> ndims(X)==2 & size(X,1)==1 & size(X,2)>=10032 X = X';0033 flagrow = 1;0034 <span class="keyword">end</span>0035 0036 <span class="comment">% Finding columns/rows/etc to be extracted</span>0037 c = ind2subm( size(X), find(X~=E) );0038 0039 <span class="comment">% Get minimuns and maximuns founds</span>0040 li = min(c,[],1)';0041 ls = max(c,[],1)';0042 0043 <span class="comment">% Mounting text: li(1):ls(1),li(2):ls(2)...</span>0044 N = ndims(X);0045 <span class="keyword">for</span> i = 1 : N0046 ind{i} = li(i):ls(i);0047 <span class="keyword">end</span>0048 0049 <span class="comment">% Making Y</span>0050 Y = X(ind{:});0051 0052 <span class="comment">% De-transposing is X is row vector</span>0053 <span class="keyword">if</span> flagrow0054 Y = Y';0055 <span class="keyword">end</span>0056 <span class="keyword">if</span> nargout>10057 varargout{1} = li';0058 varargout{2} = ls';0059 <span class="keyword">end</span></pre></div><hr><address>Generated on Fri 21-May-2004 12:38:21 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/">m2html</a></strong> © 2003</address></body></html>⌨️ 快捷键说明
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