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vangfeng

ľ³æ (СÓÐÃûÆø)

[ÇóÖú] matlab Êý¾ÝÄâºÏ£¬ÇóÖ¸½Ì£¡ ÒÑÓÐ3È˲ÎÓë

x        y
-4.03E+00        4.00E-02
-3.49E+00        4.00E-02
-3.01E+00        4.00E-02
-2.72E+00        4.36E-02
-2.45E+00        4.36E-02
-2.21E+00        5.09E-02
-1.92E+00        6.55E-02
-1.71E+00        8.36E-02
-1.41E+00        1.16E-01
-1.15E+00        1.64E-01
-8.00E-01        2.47E-01
-4.00E-01        3.78E-01
-2.67E-02        5.13E-01
3.73E-01        6.65E-01
7.73E-01        7.93E-01
9.87E-01        8.51E-01
1.17E+00        8.87E-01
1.33E+00        9.16E-01
1.57E+00        9.49E-01
1.89E+00        9.75E-01
2.24E+00        9.93E-01
2.53E+00        1.00E+00
2.88E+00        1.00E+00
4.00E+00        1.00E+00
´ó¼ÒºÃ£¬ÎÒÓÐÕâÑùµÄÁ½×éÊý¾Ý£¬ÔõÑùʹÓÃmatlabÄâºÏ³öº¯Êý£¬Çó´óÉñÖ¸½Ì¡£
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ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

vangfeng

ľ³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
2Â¥: Originally posted by Á÷½ðËêÔÂcz at 2015-04-22 10:41:49
x1=;
y1=;
  a= polyfit(x1,y1,5);
   y2=a(1)*x1.^5+a(2)*x1.^4+ a(3)*x1.^3+ a(4)*x1.^2+ a(5)*x1+a(6) ;
   plot(x1,y1,'b-',x1,y2,'r*')
set(gca,'Xtick',)%ÉèÖÃ×ø±êÖá
legend('Ô­ÇúÏß','ÄâºÏÇúÏß')
gr ...

ллÄãµÄ»Ø¸´£¬ÎÒÏëÓÃlogistic»Ø¹éÄâºÏ£¬²»ÖªµÀÔõôÓÃ
3Â¥2015-04-22 11:08:01
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 10 ¸ö»Ø´ð

Á÷½ðËêÔÂcz

Ìú³æ (³õÈëÎÄ̳)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï
¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
vangfeng: ½ð±Ò+1, ¡ï¡ï¡ïºÜÓаïÖú 2015-04-23 08:42:45
x1=[-4.03E+00
-3.49E+00      
-3.01E+00        
-2.72E+00      
-2.45E+00        
-2.21E+00        
-1.92E+00        
-1.71E+00      
-1.41E+00        
-1.15E+00        
-8.00E-01        
-4.00E-01      
-2.67E-02        
3.73E-01        
7.73E-01        
9.87E-01        
1.17E+00        
1.33E+00        
1.57E+00        
1.89E+00        
2.24E+00        
2.53E+00        
2.88E+00        
4.00E+00];
y1=[4.00E-02
      4.00E-02
       4.00E-02
      4.36E-02
       4.36E-02
       5.09E-02
     6.55E-02
     8.36E-02
     1.16E-01
       1.64E-01
        2.47E-01
        3.78E-01
        5.13E-01
       6.65E-01
        7.93E-01
        8.51E-01
        8.87E-01
       9.16E-01
        9.49E-01
       9.75E-01
        9.93E-01
       1.00E+00
        1.00E+00
       1.00E+00];
  a= polyfit(x1,y1,5);
   y2=a(1)*x1.^5+a(2)*x1.^4+ a(3)*x1.^3+ a(4)*x1.^2+ a(5)*x1+a(6) ;
   plot(x1,y1,'b-',x1,y2,'r*')
set(gca,'Xtick',[0:0.5:7])%ÉèÖÃ×ø±êÖá
legend('Ô­ÇúÏß','ÄâºÏÇúÏß')
grid on
2Â¥2015-04-22 10:41:49
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Á÷½ðËêÔÂcz

Ìú³æ (³õÈëÎÄ̳)

ÒýÓûØÌû:
3Â¥: Originally posted by vangfeng at 2015-04-22 11:08:01
ллÄãµÄ»Ø¸´£¬ÎÒÏëÓÃlogistic»Ø¹éÄâºÏ£¬²»ÖªµÀÔõôÓÃ...

y=b/(1+a*exp(-kt))£¬Çó³öÏàÓ¦²ÎÊýÖµ£¬»òÕßµ÷ÓÃÄâºÏ¹¤¾ßÏä
5Â¥2015-04-22 21:45:37
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

xgezyst

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