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³ÌÐòÈçÏ data = xlsread('data.xls'); x=data(:,1); y1=data(:,2); y2=data(:,3); n=5 p1=polyfit(x,y1,n);%5´Î¶àÏîʽ p2=polyfit(x,y2,n);%5´Î¶àÏîʽ dp1=polyder(p1);%µ¼º¯Êý dp2=polyder(p2);%µ¼º¯Êý t=linspace(0,480,97); plot(x,y1,'ro',x,y2,'+');hold on a=plotyy(t,polyval(p1,t),t,polyval(dp1,t));hold on; b=plotyy(t,polyval(p2,t),t,polyval(dp2,t)); legend('½Õ¸ÑÌåϵζÈ','½Õ¸ÑÄâºÏÇúÏß','location','southwest');hold on; a=legend(a(2),'½Õ¸ÑÉýÎÂËÙÂÊ','location','southeast');hold on; set(a,'color','w') ;hold on legend('Ë®ÌåϵζÈ','Ë®ÄâºÏÇúÏß','location','southwest') b=legend(b(2),'Ë®ÉýÎÂËÙÂÊ','location','southeast'); set(a,'color','b') ; ÎÊÌ⣺ÏÖÔÚ a=plotyy(t,polyval(p1,t),t,polyval(dp1,t));hold on; b=plotyy(t,polyval(p2,t),t,polyval(dp2,t)); ÕâÁ½¾äÀïµÄÓÒ²àË«×ø±êµÄ·¶Î§²»Ò»Ö£¬×ø±êÖµÖØºÏ£¬ ¹ØÓÚÉèÖñêÌâÀ¸µÄ²¿·Ö£¬ÍêȫһÇϲ»Í¨£¬×îºóÖ»ÏÔʾˮÌåϵ²¿·Ö£¡ legend('½Õ¸ÑÌåϵζÈ','½Õ¸ÑÄâºÏÇúÏß','location','southwest');hold on; a=legend(a(2),'½Õ¸ÑÉýÎÂËÙÂÊ','location','southeast');hold on; set(a,'color','w') ;hold on legend('Ë®ÌåϵζÈ','Ë®ÄâºÏÇúÏß','location','southwest') b=legend(b(2),'Ë®ÉýÎÂËÙÂÊ','location','southeast'); set(a,'color','b') ; Õⲿ·ÖÓïÑÔ£¬µ¥¶ÀÕë¶ÔÒ»¸ö½Õ¸ÑÌåϵµÄζȵ㡢ÄâºÏÏßÒÔ¼°Çóµ¼µÄÏÔʾ¶¼Ã»ÎÊÌ⣬µ«Ò»µ©ÓнոѺÍË®Á½¸öÌåϵ£¬ÎÒ¾ÍÃÉÁË¡£Çó´óÉñÖ¸µ¼£¬ÓÅ»¯Õâ¶Î³ÌÐò |
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ben_ladeng: ½ð±Ò+2, ÍË»¹ÐüÉͽð±Ò 2013-11-15 09:29:28
ben_ladeng: °Ñ¸øÂ¥Ö÷µÄÆÀÓï¸øÄãÁË£¬±§Ç¸¹þ 2013-11-15 09:30:21
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ben_ladeng: ½ð±Ò+2, ÍË»¹ÐüÉͽð±Ò 2013-11-15 09:29:28
ben_ladeng: °Ñ¸øÂ¥Ö÷µÄÆÀÓï¸øÄãÁË£¬±§Ç¸¹þ 2013-11-15 09:30:21
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