?? matlab畫三維圖的兩種方法.htm
字號:
<!-- saved from url=(0066)http://hi.baidu.com/mynana/blog/item/3c79c1ce6b65cb0393457e7a.html --><HTML><HEAD><META http-equiv="Content-Type" content="text/html; charset=GB2312"><TITLE>Matlab畫三維圖的兩種方法_夢想正在起飛</TITLE><STYLE>.error{color:#FF0000;font-size:12px}</STYLE><SCRIPT type="text/javascript" src="./Matlab畫三維圖的兩種方法_files/global.js"></SCRIPT><SCRIPT language="javascript" src="./Matlab畫三維圖的兩種方法_files/popup.js"></SCRIPT><SCRIPT language="JavaScript" src="./Matlab畫三維圖的兩種方法_files/g_spjs.js"></SCRIPT><SCRIPT language="javascript"><!--var allkey="";var i=0;var flag=0;function setpv(allnum){ var num = allnum.split('_'); document.getElementById("result").innerHTML=num[0];} function checkMail(s) { var pattern=/\w+@\w+\.[a-z]+/; if(pattern.test(s)) { return true; } else { return false; } } function checkeandu(eanduid){ var eanduvalue=G(eanduid).value; var len=bytes(eanduvalue); if(len>128) { showErr(2,"您輸入的網址或郵箱太長，請保持在128字節以內。"); return false; } else { return true; } }function cmtdel(str){ var pop=new Popup({ contentType:3,isReloadOnClose:false,width:340,height:80}); pop.setContent("title","刪除評論"); pop.setContent("confirmCon","您確定要徹底刪除這條評論嗎？"); pop.setContent("callBack",delCallback2); pop.setContent("parameter",{fid:str,popup:pop}); pop.build(); pop.show(); return false;}function delCallback2(para){ var o_pop=para["popup"]; o_pop.config.contentType=1; o_pop.setContent("contentUrl",""); o_pop.reBuild(); G(para["fid"]).target=o_pop.iframeIdName; eval("document."+para["fid"]).submit();}function checkname(strid){ var ele=document.getElementById(strid); var len=bytes(ele.value); if(len>49) { showErr(1,"您輸入的姓名太長，請保持在49字節以內。"); return false; } else { if(len==0) { document.getElementById(strid).value="匿名網友"; } return true; } }function checktext(textid){ document.getElementById(textid).value=trimlr(textid); var str=trimrn(textid); len=str.length; if(len==0 || ((/^[\s, ]+$/gi).test(str)) ) { showErr(3,"您必須輸入評論內容，請檢查。"); return false; } else { if(len>1000) { showErr(3,"您輸入的評論內容太長，請保持在500字以內。"); return false; } return true; } }function showErr(index,str){ G(index+"_err").style.display=""; G(index+"_err_con").innerHTML=str;}function hidErr(index){ G(index+"_err").style.display="none"; G(index+"_err_con").innerHTML="";}function alertPop(tit,con){ var pop=new Popup({ contentType:4,isReloadOnClose:false,width:340,height:80}); pop.setContent("title",tit); pop.setContent("alertCon",con); pop.build(); pop.show();}function cmtfull(){ var cnum=1; if(cnum>=50000) { alertPop("發表評論","單篇日志評論數最多為50000條."); return false; } else { return true; }}function checkcmtform(){ if(checkname("spBlogCmtor")&&checkeandu("spBlogCmtURL")&&checktext("spBlogCmtText")&&cmtfull()) { submitForm(); return true; } else { return false; }}var g_pop=null;function submitForm(){ g_pop=new Popup({ contentType:1,isReloadOnClose:false,width:340,height:80}); g_pop.setContent("title","添加評論"); g_pop.setContent("contentUrl",""); g_pop.setContent("someDisabledBtn","btn_ok"); g_pop.build(); G("popFormSubmit").target=g_pop.iframeIdName; g_pop.show();}function g_close_pop(){ g_pop.close();}function formatonlinpic(){var picobj=document.getElementsByName("onlinepic");var picnum=picobj.length; for(var i=0;i<picnum;i++) { if(picobj[i].width>200) { picobj[i].width=200; } if(picobj[i].height>200) { picobj[i].height=200; } } try{document.getElementById("btn_ok").disabled = "";}catch(e){}}function addToFavor(){var blogTitle='Matlab畫三維圖的兩種方法'.replace(/'/g,'\'');window.open('http://cang.baidu.com/do/add?it='+encodeURIComponent(blogTitle+'_百度空間')+'&iu='+encodeURIComponent(location.href)+'&fr=sp#nw=1','_s','scrollbars=no,width=600,height=450,right=75,top=20,status=no,resizable=yes'); return false;}var isIE = /*@cc_on!@*/false;function tracker(did,a){ return function(){ var t=new Date().getTime(); var href=a.href; if(isIE){ var r = /href\s*=\s*("|')?([^\s]*)\1/gi; if(r.test(a.outerHTML)) href = RegExp.$2; } new Image().src = "http://hi.baidu.com/sys/statlog/1.gif?m=" + did + "&v=" + encodeURIComponent(href) + "&c=" + encodeURIComponent(location.href) + "&t="+t; }}function tracker_init(did){ var _s=document.getElementById(did); var as = _s.getElementsByTagName('A'); for(var i = 0, j = as.length; i < j; i ++){ var a = as[i]; if(isIE){ a.attachEvent("onclick", tracker(did,a)); }else{ a.addEventListener("click", tracker(did,a), false); } }}//--></SCRIPT><SCRIPT type="text/javascript">/*<![CDATA[*/var RelatedDocData = null, GetAndEval = false;(function(){ var xhr = BdAjax.getXHR(); if(xhr == null){ RelatedDocData = -1; return; } xhr.open("GET", "/sys/search?type=8&word=Matlab%BB%AD%C8%FD%CE%AC%CD%BC%B5%C4%C1%BD%D6%D6%B7%BD%B7%A8&item=3c79c1ce6b65cb0393457e7a&t=" + new Date().getTime(), true); xhr.onreadystatechange = function(){ if(xhr.readyState == 4){ if(xhr.status == 0 || xhr.status == 200){ if(GetAndEval){ eval(xhr.responseText); }else{ RelatedDocData = xhr.responseText; } } } } xhr.send(null);})();/*]]>*/</SCRIPT><LINK rel="stylesheet" type="text/css" href="./Matlab畫三維圖的兩種方法_files/mods.css"><LINK rel="stylesheet" type="text/css" href="./Matlab畫三維圖的兩種方法_files/66ddd309ffc8f282d1581bf8.css"><LINK rel="stylesheet" type="text/css" href="./Matlab畫三維圖的兩種方法_files/space.css"><STYLE type="text/css"> /*<![CDATA[*/#usrbar{padding:4px 10px 3px 0;font-size:12px;height:19px;line-height:19px;color:#000000;font-family:Arial;text-align:right;background:#ffffff;filter:alpha(opacity=65);-moz-opacity:0.5;width:auto !important;width:100%;letter-spacing:normal}#usrbar a,#usrbar a:link,#usrbar a:visited{color:#0000CC;text-decoration:underline}#ft{clear:both;height:20px;line-height:20px;color:#666666;font-size:12px;font-family:Arial;text-align:center}#ft a,#ft a:link,#ft a:visited{color:#7777CC;text-decoration:underline}#usrbar,#usrbar a,#usrbar a:link,#usrbar a:visited,#ft,#ft a,#ft a:link,#ft a:visited{letter-spacing:normal}/*]]>*/</STYLE><STYLE type="text/css">/*<![CDATA[*/#in_related_doc a { text-decoration:none; }/*]]>*/</STYLE></HEAD><BODY onload="formatonlinpic();"><CENTER><SCRIPT type="text/javascript">/*<![CDATA[*/if(top.location != self.location){ top.location = self.location;}var myref = encodeURI("http://hi.baidu.com/mynana/blog/item/3c79c1ce6b65cb0393457e7a%2Ehtml");/*]]>*/</SCRIPT><DIV id="usrbar"><NOBR> <A href="http://www.baidu.com/" target="_blank">百度首頁</A> | <A id="hi_index" href="http://hi.baidu.com/" target="_blank">百度空間</A> <SCRIPT type="text/javascript"> document.write('| <a href="http://passport.baidu.com/?login&tpl=sp&tpl_reg=sp&u=http://hi.baidu.com' + encodeURI('/mynana/blog/item/3c79c1ce6b65cb0393457e7a%2Ehtml') + '">登錄</a>'); </SCRIPT>| <A href="http://passport.baidu.com/?login&tpl=sp&tpl_reg=sp&u=http://hi.baidu.com/mynana/blog/item/3c79c1ce6b65cb0393457e7a%252Ehtml">登錄</A> </NOBR></DIV><DIV id="main" align="left"><!--[if IE]><script>var objmain = document.getElementById("main");function updatesize(){ var bodyw = window.document.body.offsetWidth; if(bodyw <= 790) objmain.style.width="772px"; else if(bodyw >= 1016) objmain.style.width="996px"; else objmain.style.width="100%"; }updatesize(); window.onresize = updatesize;</script><![endif]--> <DIV id="header"> <DIV class="lc"><DIV class="rc"></DIV></DIV><DIV class="tit"><A href="http://hi.baidu.com/mynana" class="titlink" title="wwxbei的空間 http://hi.baidu.com/mynana">夢想正在起飛</A></DIV><DIV class="desc">WHERE IS MY GIRL</DIV><DIV id="tabline"> </DIV> <DIV id="tab"><A href="http://hi.baidu.com/mynana">主頁</A><A href="http://hi.baidu.com/mynana/blog" class="on">博客</A><A href="http://hi.baidu.com/mynana/album">相冊</A><SPAN>|</SPAN><A href="http://hi.baidu.com/mynana/profile">個人檔案</A> <SPAN>|</SPAN><A href="http://hi.baidu.com/mynana/friend">好友</A> </DIV></DIV><DIV class="stage"><DIV class="stagepad"><DIV style="width:100%"> <TABLE width="100%" border="0" cellspacing="0" cellpadding="0" class="modth"> <TBODY><TR><TD class="modtl" width="7"> </TD> <TD class="modtc" nowrap=""><DIV class="modhead"><SPAN class="modtit">查看文章</SPAN></DIV></TD> <TD class="modtc" nowrap="" align="right"> <TD class="modtr" width="7"> </TD> </TR></TBODY></TABLE><DIV id="m_blog" class="modbox"><DIV class="tit">Matlab畫三維圖的兩種方法</DIV><DIV class="date">2006-10-13 20:36</DIV><TABLE style="table-layout:fixed"><TBODY><TR><TD><DIV id="blog_text" class="cnt"><P> 這幾天看到Ras函數（Rastrigin's Function），這個函數對模擬退火、進化計算等算法具有很強的欺騙性，因為它有非常多的局部最小值點和局部最大值點，很容易使算法陷入局部最優，而不能得到全局最優解。</P><P> Ras函數為：<BR><IMG border="0" small="0" class="blogimg" src="./Matlab畫三維圖的兩種方法_files/147b9b25b5c8f96035a80f1b.jpg"><BR><BR> Matlab的Help里面有這個函數的三維圖像，但是沒有解釋是怎樣畫出來的。經過請教同學，得出兩種方法，現記錄在此。</P><P>第一：<BR>[x,y]=meshgrid([0:0.1:4]);<BR>z=20+x.*x+y.*y-10*(cos(2*pi*x)+cos(2*pi*y)); <BR>surfc(x,y,z)<BR>shading interp</P><P>第二：<BR>f=@(x,y) 20+x.*x+y.*y-10*(cos(2*pi*x)+cos(2*pi*y));<BR> ezsurf(f,[-2 2])<BR>shading interp </P><P> </P></DIV></TD></TR></TBODY></TABLE><BR><DIV class="opt"><A href="http://hi.baidu.com/mynana/blog/category/%BF%C6%D1%D0%D6%AE%C2%B7" title="查看該分類中所有文章">類別：科研之路</A> | <A title="將此文章添加到百度搜藏" href="http://cang.baidu.com/do/add" onclick="return addToFavor();" target="_blank">添加到搜藏</A> | 瀏覽(<SPAN id="result">4296</SPAN>)?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -