layout: post title: 随机抽样一致性算法matlab示例代码 categories:
前一篇博文曾提到随机抽样一致性算法, 这里给出一段利用这种方法计算扩散系数的matlab示例代码. 代码中同时测试了matlab的全局优化算法.
<table class="highlighttable"><th colspan="2" style="text-align:left">msd.m</th><tr><td><div class="linenodiv" style="background-color: #f0f0f0; padding-right: 10px"><pre style="line-height: 125%"> 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</pre></div></td><td class="code"><div class="highlight" style="background: #f8f8f8"><pre style="line-height: 125%"><span style="color: #AA22FF; font-weight: bold">function</span><span style="color: #bbbbbb"> </span><span style="color: #00A000">MSD</span><span style="color: #bbbbbb"></span> clc;<span style="color: #bbbbbb"> </span>clear<span style="color: #bbbbbb"> </span>all;<span style="color: #bbbbbb"> </span>close<span style="color: #bbbbbb"> </span>all;<span style="color: #bbbbbb"></span> <span style="color: #AA22FF; font-weight: bold">global</span><span style="color: #bbbbbb"> </span>t<span style="color: #bbbbbb"> </span>msd<span style="color: #bbbbbb"> </span>Ninc<span style="color: #bbbbbb"> </span>Reps<span style="color: #bbbbbb"> </span>Izro<span style="color: #bbbbbb"></span> <span style="color: #008800; font-style: italic">%%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">文件名称及Ransac设定</span><span style="color: #bbbbbb"></span> file<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>msd.xvg<span style="color: #666666">'</span>;<span style="color: #bbbbbb"></span> Npnt<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #666666">5</span>;<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">随机选择点数</span><span style="color: #bbbbbb"></span> Iter<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #666666">1000</span>;<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">最大循环数</span><span style="color: #bbbbbb"></span> Reps<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #666666">1.5</span>;<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">最大偏差</span><span style="color: #bbbbbb"></span> Rinc<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #666666">0.5</span>;<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">使用点数的比例</span><span style="color: #bbbbbb"></span> Izro<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #666666">0</span>;<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">拟合直线是否过零点,</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">0:</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">过;</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">非零:</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">不过</span><span style="color: #bbbbbb"></span> <span style="color: #008800; font-style: italic">%%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">获取文件头行数</span><span style="color: #bbbbbb"></span> fid<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>fopen(file);<span style="color: #bbbbbb"></span> txt<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>fgetl(fid);<span style="color: #bbbbbb"></span> idx<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #AA22FF">length</span>(strfind(txt,<span style="color: #BB4444">'</span>#<span style="color: #BB4444">'</span>))<span style="color: #666666">+</span><span style="color: #AA22FF">length</span>(strfind(txt,<span style="color: #BB4444">'</span>@<span style="color: #BB4444">'</span>));<span style="color: #bbbbbb"></span> Line=<span style="color: #666666">0</span>;<span style="color: #bbbbbb"></span> <span style="color: #AA22FF; font-weight: bold">while</span><span style="color: #bbbbbb"> </span>idx<span style="color: #666666">>0</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>Line=<span style="color: #bbbbbb"> </span>Line<span style="color: #666666">+1</span>;<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>txt<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>fgetl(fid);<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>idx<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #AA22FF">length</span>(strfind(txt,<span style="color: #BB4444">'</span>#<span style="color: #BB4444">'</span>))<span style="color: #666666">+</span><span style="color: #AA22FF">length</span>(strfind(txt,<span style="color: #BB4444">'</span>@<span style="color: #BB4444">'</span>));<span style="color: #bbbbbb"></span> <span style="color: #AA22FF; font-weight: bold">end</span><span style="color: #bbbbbb"></span> <span style="color: #008800; font-style: italic">%%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">读入数据,</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">准备作图</span><span style="color: #bbbbbb"></span> [t,<span style="color: #bbbbbb"> </span>msd]=textread(file,<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span><span style="color: #008800; font-style: italic">%f</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%f',</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">'headerlines',Line);</span><span style="color: #bbbbbb"></span> h<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>plot(<span style="color: #666666">0</span>,[<span style="color: #666666">0</span>;<span style="color: #bbbbbb"> </span><span style="color: #666666">0</span>],<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>EraseMode<span style="color: #666666">'</span>,<span style="color: #BB4444">'</span>background<span style="color: #666666">'</span>);<span style="color: #bbbbbb"></span> set(h(<span style="color: #666666">1</span>),<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>XData<span style="color: #666666">'</span>,t,<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>YData<span style="color: #666666">'</span>,msd);<span style="color: #bbbbbb"></span> axis([<span style="color: #666666">0</span><span style="color: #bbbbbb"> </span>max(t)<span style="color: #bbbbbb"> </span><span style="color: #666666">0</span><span style="color: #bbbbbb"> </span>max(msd)]);<span style="color: #bbbbbb"></span> <span style="color: #008800; font-style: italic">%%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">RANSAC</span><span style="color: #bbbbbb"></span> Ndat<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #AA22FF">length</span>(msd);<span style="color: #bbbbbb"></span> Ninc<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #AA22FF">round</span>(Rinc<span style="color: #666666">*</span>Ndat);<span style="color: #bbbbbb"></span> Nbst<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #666666">0</span>;<span style="color: #bbbbbb"> </span>Pbst=[];<span style="color: #bbbbbb"></span> Pcst<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #AA22FF">zeros</span>(Npnt,<span style="color: #666666">1</span>);<span style="color: #bbbbbb"></span> <span style="color: #AA22FF; font-weight: bold">if</span><span style="color: #bbbbbb"> </span>Izro<span style="color: #666666">~=0</span>;<span style="color: #bbbbbb"> </span>Pcst=<span style="color: #AA22FF">ones</span>(Npnt,<span style="color: #666666">1</span>);<span style="color: #bbbbbb"> </span><span style="color: #AA22FF; font-weight: bold">end</span><span style="color: #bbbbbb"></span> warning(<span style="color: #BB4444">'</span>off<span style="color: #666666">'</span>,<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>MATLAB:rankDeficientMatrix<span style="color: #666666">'</span>);<span style="color: #bbbbbb"></span> <span style="color: #AA22FF; font-weight: bold">for</span><span style="color: #bbbbbb"> </span><span style="color: #AA22FF">i</span><span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #666666">1</span>:Iter<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>idx<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>randperm(Ninc,<span style="color: #bbbbbb"> </span>Npnt);<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">随机选点</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>t0<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>[t(idx),<span style="color: #bbbbbb"> </span>Pcst];<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>par<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>(t0<span style="color: #666666">\</span>msd(idx))<span style="color: #666666">'</span>;<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">或使用</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">polyfit(x,y,n),</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">通用但速度慢</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>dst<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #AA22FF">abs</span>(par(<span style="color: #666666">1</span>)<span style="color: #666666">*</span>t(<span style="color: #666666">1</span>:Ninc)<span style="color: #666666">+</span>par(<span style="color: #666666">2</span>)<span style="color: #666666">-</span>msd(<span style="color: #666666">1</span>:Ninc));<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">点间距离</span><span style="color: #bbbbbb"></span> <span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">dst</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">=</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">abs(par(1)*t(1:Ninc)+par(2)-msd(1:Ninc))/sqrt(P(1)*P(1)+1);</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">垂直距离</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>num<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #AA22FF">length</span>(<span style="color: #AA22FF">find</span>(dst<span style="color: #666666"><</span>Reps));<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span><span style="color: #AA22FF; font-weight: bold">if</span><span style="color: #bbbbbb"> </span><span style="color: #AA22FF">mod</span>(<span style="color: #AA22FF">i</span>,<span style="color: #666666">100</span>)<span style="color: #666666">==0</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>title(sprintf(<span style="color: #BB4444">'</span>Iter:<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%d</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">Nbst:</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%d',</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">i,</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">Nbst));</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>drawnow;<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span><span style="color: #AA22FF; font-weight: bold">end</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span><span style="color: #AA22FF; font-weight: bold">if</span><span style="color: #bbbbbb"> </span>num<span style="color: #666666">></span>Nbst<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>Nbst<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>num;<span style="color: #bbbbbb"> </span>Pbst<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>par;<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>set(h(<span style="color: #666666">2</span>),<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>XData<span style="color: #666666">'</span>,t,<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>YData<span style="color: #666666">'</span>,Pbst(<span style="color: #666666">1</span>)<span style="color: #666666">*</span>t<span style="color: #666666">+</span>Pbst(<span style="color: #666666">2</span>));<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>drawnow;<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span><span style="color: #AA22FF; font-weight: bold">end</span><span style="color: #bbbbbb"></span> <span style="color: #AA22FF; font-weight: bold">end</span><span style="color: #bbbbbb"></span> <span style="color: #008800; font-style: italic">%%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">全局搜索方法</span><span style="color: #bbbbbb"></span> opt<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>optimset(<span style="color: #BB4444">'</span>Algorithm<span style="color: #666666">'</span>,<span style="color: #BB4444">'</span>sqp<span style="color: #666666">'</span>);<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">interior-point/sqp/active-set</span><span style="color: #bbbbbb"></span> fmin<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>createOptimProblem(<span style="color: #BB4444">'</span>fmincon<span style="color: #666666">'</span>,<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>objective<span style="color: #666666">'</span>,@ObjFun,<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">...</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>x0<span style="color: #666666">'</span>,[<span style="color: #666666">0</span>,<span style="color: #666666">0</span>],<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>lb<span style="color: #666666">'</span>,[<span style="color: #666666">0</span>,<span style="color: #666666">0</span>],<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>ub<span style="color: #666666">'</span>,[<span style="color: #AA22FF">inf</span>,<span style="color: #AA22FF">inf</span>],<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>options<span style="color: #666666">'</span>,opt);<span style="color: #bbbbbb"></span> gs<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>GlobalSearch(<span style="color: #BB4444">'</span>Display<span style="color: #666666">'</span>,<span style="color: #BB4444">'</span>iter<span style="color: #666666">'</span>);<span style="color: #bbbbbb"></span> [Pgs,<span style="color: #bbbbbb"> </span>Ngs]<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>run(gs,<span style="color: #bbbbbb"> </span>fmin);<span style="color: #bbbbbb"></span> <span style="color: #AA22FF; font-weight: bold">if</span><span style="color: #bbbbbb"> </span>Izro<span style="color: #666666">==0</span>;<span style="color: #bbbbbb"> </span>Pgs(<span style="color: #666666">2</span>)=<span style="color: #666666">0</span>;<span style="color: #bbbbbb"> </span><span style="color: #AA22FF; font-weight: bold">end</span><span style="color: #bbbbbb"></span> <span style="color: #008800; font-style: italic">%%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">最小二乘方法</span><span style="color: #bbbbbb"></span> t0<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>[t(<span style="color: #666666">1</span>:Ninc),<span style="color: #bbbbbb"> </span><span style="color: #AA22FF">zeros</span>(Ninc,<span style="color: #666666">1</span>)];<span style="color: #bbbbbb"></span> <span style="color: #AA22FF; font-weight: bold">if</span><span style="color: #bbbbbb"> </span>Izro<span style="color: #666666">~=0</span>;<span style="color: #bbbbbb"> </span>t0<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>[t(<span style="color: #666666">1</span>:Ninc),<span style="color: #bbbbbb"> </span><span style="color: #AA22FF">ones</span>(Ninc,<span style="color: #666666">1</span>)];<span style="color: #bbbbbb"> </span><span style="color: #AA22FF; font-weight: bold">end</span><span style="color: #bbbbbb"></span> Plsq<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span>(t0<span style="color: #666666">\</span>msd(<span style="color: #666666">1</span>:Ninc))<span style="color: #666666">'</span>;<span style="color: #bbbbbb"></span> <span style="color: #008800; font-style: italic">%%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">作图</span><span style="color: #bbbbbb"></span> plot(t,<span style="color: #bbbbbb"> </span>msd,<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>k.<span style="color: #666666">'</span>,<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">...</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>t,polyval(Plsq,<span style="color: #bbbbbb"> </span>t),<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>r<span style="color: #666666">'</span>,<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">...</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>t,polyval(Pbst,<span style="color: #bbbbbb"> </span>t),<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>g<span style="color: #666666">'</span>,<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">...</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>t,polyval(Pgs,<span style="color: #bbbbbb"> </span>t),<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>b<span style="color: #666666">'</span>,<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>linewidth<span style="color: #666666">'</span>,<span style="color: #666666">2</span>)<span style="color: #bbbbbb"></span> legend(<span style="color: #BB4444">'</span>MSD<span style="color: #666666">'</span>,<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>LSQ<span style="color: #666666">'</span>,<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>RANSAC<span style="color: #666666">'</span>,<span style="color: #bbbbbb"> </span><span style="color: #BB4444">'</span>GlobalSearch<span style="color: #666666">'</span>);<span style="color: #bbbbbb"></span> axis([<span style="color: #666666">0</span><span style="color: #bbbbbb"> </span>max(t)<span style="color: #bbbbbb"> </span><span style="color: #666666">0</span><span style="color: #bbbbbb"> </span>max(msd)]);<span style="color: #bbbbbb"></span> <span style="color: #AA22FF; font-weight: bold">end</span><span style="color: #bbbbbb"></span> <span style="color: #008800; font-style: italic">%%</span><span style="color: #bbbbbb"></span> <span style="color: #AA22FF; font-weight: bold">function</span><span style="color: #bbbbbb"> </span>ObjFun<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #00A000">ObjFun</span>(P)<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span><span style="color: #AA22FF; font-weight: bold">global</span><span style="color: #bbbbbb"> </span>t<span style="color: #bbbbbb"> </span>msd<span style="color: #bbbbbb"> </span>Ninc<span style="color: #bbbbbb"> </span>Reps<span style="color: #bbbbbb"> </span>Izro<span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span><span style="color: #AA22FF; font-weight: bold">if</span><span style="color: #bbbbbb"> </span>Izro<span style="color: #666666">==0</span>;<span style="color: #bbbbbb"> </span>P(<span style="color: #666666">2</span>)=<span style="color: #666666">0</span>;<span style="color: #bbbbbb"> </span><span style="color: #AA22FF; font-weight: bold">end</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>dst<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #AA22FF">abs</span>(P(<span style="color: #666666">1</span>)<span style="color: #666666">*</span>t(<span style="color: #666666">1</span>:Ninc)<span style="color: #666666">+</span>P(<span style="color: #666666">2</span>)<span style="color: #666666">-</span>msd(<span style="color: #666666">1</span>:Ninc));<span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">点间距离</span><span style="color: #bbbbbb"></span> <span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">dst</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">=</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">abs(P(1)*t(1:Ninc)+P(2)-msd(1:Ninc))/sqrt(P(1)*P(1)+1);</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">%</span><span style="color: #bbbbbb"> </span><span style="color: #008800; font-style: italic">垂直距离</span><span style="color: #bbbbbb"></span> <span style="color: #bbbbbb"> </span>ObjFun<span style="color: #bbbbbb"> </span>=<span style="color: #bbbbbb"> </span><span style="color: #AA22FF">length</span>(<span style="color: #AA22FF">find</span>(dst<span style="color: #666666">></span>Reps));<span style="color: #bbbbbb"></span> <span style="color: #AA22FF; font-weight: bold">end</span><span style="color: #bbbbbb"></span> </pre></div> </td></tr></table>