matlab对数拟合。需要求出y=alg(x)+b中的a、b的值
这是x、y的数值x=[0.5,1.0,1.5,2.0,2.5,3.0,3.5,4.0,4.5,5.0,5.5,6.0,6.5,7.0,7.5,8.0,8.5,9.0,9....
这是x、y的数值
x=[0.5,1.0,1.5,2.0,2.5,3.0,3.5,4.0,4.5,5.0,5.5,6.0,6.5,7.0,7.5,8.0,8.5,9.0,9.5,10.0...
10.5,11.0,11.5,12.0,12.5,13.0,13.5,14.0,14.5,15.0,15.5,16.0,16.5,17.0,17.5,18.0,18.5,19.0,19.5,20.0];
y=[-30,-32,-34,-37,-39,-43,-45,-46,-46,-47,-49,-51,-56,-57,-61,-63,-66,-62,-62,...
-62,-64,-63,-65,-59,-66,-67,-70,-71,-67,-62,-63,-68,-69,-65,-65,-68,-68,-68,-70,-75];
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x=[0.5,1.0,1.5,2.0,2.5,3.0,3.5,4.0,4.5,5.0,5.5,6.0,6.5,7.0,7.5,8.0,8.5,9.0,9.5,10.0...
10.5,11.0,11.5,12.0,12.5,13.0,13.5,14.0,14.5,15.0,15.5,16.0,16.5,17.0,17.5,18.0,18.5,19.0,19.5,20.0];
y=[-30,-32,-34,-37,-39,-43,-45,-46,-46,-47,-49,-51,-56,-57,-61,-63,-66,-62,-62,...
-62,-64,-63,-65,-59,-66,-67,-70,-71,-67,-62,-63,-68,-69,-65,-65,-68,-68,-68,-70,-75];
麻烦了！！ 展开
1个回答
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该问题可以用非线性回归函数（nlinfit）来拟合，拟合后可以得到
a=-30.4275，b=-30.7388
决定系数R²：0.91703
追问
我想问一下为什么，您的图片上和文字答案有个不相符呢？还有，您能讲一下具体细节吗，
追答
应该是，a=-13.2145，b=-30.7388
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