Fit the Data to a Quadratic Function with a y-offset (y = b+mx^2) error

7 次查看（过去 30 天）
Evve Land
Evve Land 2020-10-16
评论： Matt J 2020-10-16
How do I fix this error code?
Data Set:
Here is a data set with uncertainties in y-direction
clear
X=[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
Y=[4.2,7.5,19.5,32.8,54.2,80.9,112.2,154.5,197.1,248.0,306.3];
dY=[3.2, 5.4, 8.5, 14.6, 23.6, 32.7, 40.7, 41.8, 34.8, 37.9, 23.9];
Fit the Data to a Quadratic Function with a y-offset (y = b+mx^2)
linear_fit='b+m*x^2';% INSERT CODE HERE TO DEFINE THE FIT FUNCTION
start_values=[1.0,4.0];% INSERT CODE HERE TO CREATE THE START VALUES
[f1,gof1]=fit(X',Y',linear_fit,'Start',start_values)% INSERT CODE HERE TO APPLY THE FIT FUNCTION
!Check for missing argument or incorrect argument data type in call to function 'fit'.

请先登录，再回答此问题。

采纳的回答

Matt J
Matt J 2020-10-16
编辑：Matt J 2020-10-16
I get no error messages when I run your code. However, you do not need fit() to perform this fit. You can just use polyfit,
p=polyfit(X.^2,Y,1);
m=p(1);
b=p(2);

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Quadratic Programming and Cone Programming 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by