Keep getting error message for polyfit

2 次查看（过去 30 天）
Sarah Gilliam
Sarah Gilliam 2020-12-11
回答： Image Analyst 2020-12-12
I'm following a tutorial for an example out of a textbook, I've copied the instructors code exactly but keep getting an error message
My code:
x = 0:0.3:1.8;
y = [.5 .6 .8 1.3 2 3.2 4.8];
plot(x, y, 'b-*')
f = fit(x',y', 'poly2');
error message:
Check for missing argument or incorrect argument data type in call to function 'fit'.
Error in Week_9 (line 6)
f = fit(x',y', 'poly2');
I can't find the error in my code

请先登录，再回答此问题。

回答（1 个）

Image Analyst
Image Analyst 2020-12-12
Try polyfit() and polyval()
x = 0:0.3:1.8;
y = [.5 .6 .8 1.3 2 3.2 4.8];
plot(x, y, 'b-*', 'LineWidth', 5)
coefficients = polyfit(x(:),y(:), 3);
f = polyval(coefficients, x);
hold on;
plot(x, f, 'ro-', 'LineWidth', 2, 'MarkerSize', 15);
grid on;
legend('y', 'f');

类别

在 Help Center 和 File Exchange 中查找有关 Get Started with Curve Fitting Toolbox 的更多信息

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by