display functions and coefficients from the basic fit tool box on a plot

5 次查看（过去 30 天）

显示更早的评论

Jamie Williamson 2021-9-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1453349-display-functions-and-coefficients-from-the-basic-fit-tool-box-on-a-plot

评论： Chunru 2021-9-15

Is there away to show basic fitting on a plot whenever the code is run? rather then going to tools > basic fitting and manually doing it everytime?? I want to show the function and coeffecients on a plot everytime the code is run and the plots are produced

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

回答（2 个）

Chunru 2021-9-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1453349-display-functions-and-coefficients-from-the-basic-fit-tool-box-on-a-plot#answer_787504

编辑：Chunru 2021-9-15

在 MATLAB Online 中打开

Use your own fitting function:

% Some data

x = 0:.1:10;

y = x.^2 +2*x + 3 +randn(size(x))*.4;

plot(x, y)

% fitting (polyfit of order of 2)

p = polyfit(x, y, 2)

p = 1×3

1.0135 1.8552 3.2872

% Plot the fitting result

hold on

plot(x, polyval(p, x), 'r--')

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Jamie Williamson 2021-9-15

Iv got some data points and three fuctions I want to plot with a curve fit and also have the functions printed on the graphs. is this possible??

Data Functions

x y y = 0.6580x-1.337209

3.25 0.801369 y = 0.0632e^0.7817x

3.375 0.883622 y = 0.0379x^2.5890

请先登录，再进行评论。

Chunru 2021-9-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1453349-display-functions-and-coefficients-from-the-basic-fit-tool-box-on-a-plot#answer_787524

编辑：Chunru 2021-9-15

在 MATLAB Online 中打开

xy = [3.25 0.801369;

3.375 0.883622];

x = xy(:, 1);

y = xy(:, 2);

f1 = @(x) 0.6580*x-1.337209;

f2 = @(x) 0.0632*exp(0.7817*x);

f3 = @(x) 0.0379*x.^2.5890;

f1str = char(f1);

f2str = char(f2);

f3str = char(f3);

plot(x, y, 'b');

hold on

fplot(f1, x([1 end])', 'g');

fplot(f2, x([1 end])', 'k');

fplot(f3, x([1 end])', 'r');

legend({'Data', f1str(5:end), f2str(5:end), f3str(5:end)}, 'Location', 'Best')

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Chunru 2021-9-15

What do you mean "subplots"?

请先登录，再进行评论。

请先登录，再回答此问题。

类别

AI and Statistics Curve Fitting Toolbox Interpolation

在 Help Center 和 File Exchange 中查找有关 Interpolation 的更多信息

标签

产品

MATLAB

版本

R2021a

Community Treasure Hunt

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

Translated by