How can I plot 2 fit curves in the same plot using cftool ?

Question

Angelavtc 2020-2-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/505546-how-can-i-plot-2-fit-curves-in-the-same-plot-using-cftool

评论： Angelavtc 2020-2-16

Hello to all!

I hope you are doing well. As the question says, I just would like to know if it is possible to plot 2 previosuly fit curves in the same plot using cftool, so far I havent found anything about this.

My matlab version is 2019.

Thanks in advance!

Angela

2 个评论
显示无隐藏无

darova 2020-2-15

Please attach your code

Angelavtc 2020-2-15

在 MATLAB Online 中打开

Yes, like for example put together the following 2 fits.

Fit 1.-

function [fitresult, gof] = createFit(x_dec_12_s, Price_dec_12_s)
%CREATEFIT(X_DEC_12_S,PRICE_DEC_12_S)
%  Create a fit.
%
%  Data for 'december 2012' fit:
%      X Input : x_dec_12_s
%      Y Output: Price_dec_12_s
%  Output:
%      fitresult : a fit object representing the fit.
%      gof : structure with goodness-of fit info.
%
%  See also FIT, CFIT, SFIT.
%  Auto-generated by MATLAB on 15-Feb-2020 16:58:00
%% Fit: 'december 2012'.
[xData, yData] = prepareCurveData( x_dec_12_s, Price_dec_12_s );
% Set up fittype and options.
ft = fittype( 'poly6' );
excludedPoints = excludedata( xData, yData, 'Indices', [3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 30 44 46 47 48 54 676 712 780 858 865 877 889 892 903 912 913 914 915 916 917 923 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 949] );
opts = fitoptions( 'Method', 'LinearLeastSquares' );
opts.Exclude = excludedPoints;
% Fit model to data.
[fitresult, gof] = fit( xData, yData, ft, opts );
% Plot fit with data.
figure( 'Name', 'december 2012' );
plot( fitresult, xData, yData, excludedPoints );
% Label axes
xlabel( 'x_dec_12_s', 'Interpreter', 'none' );
ylabel( 'Price_dec_12_s', 'Interpreter', 'none' );
grid on

Fit 2.-

function [fitresult, gof] = createFits(x_dec_12_s, Price_dec_12_s, x_dec_13_s, Price_dec_13_s)
%CREATEFITS(X_DEC_12_S,PRICE_DEC_12_S,X_DEC_13_S,PRICE_DEC_13_S)
%  Create fits.
%
%  Data for 'december 2012' fit:
%      X Input : x_dec_12_s
%      Y Output: Price_dec_12_s
%  Data for 'december 2013' fit:
%      X Input : x_dec_13_s
%      Y Output: Price_dec_13_s
%  Output:
%      fitresult : a cell-array of fit objects representing the fits.
%      gof : structure array with goodness-of fit info.
%
%  See also FIT, CFIT, SFIT.
%  Auto-generated by MATLAB on 15-Feb-2020 17:05:00
%% Initialization.
% Initialize arrays to store fits and goodness-of-fit.
fitresult = cell( 2, 1 );
gof = struct( 'sse', cell( 2, 1 ), ...
    'rsquare', [], 'dfe', [], 'adjrsquare', [], 'rmse', [] );
%% Fit: 'december 2012'.
[xData, yData] = prepareCurveData( x_dec_12_s, Price_dec_12_s );
% Set up fittype and options.
ft = fittype( 'poly6' );
excludedPoints = excludedata( xData, yData, 'Indices', [3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 30 44 46 47 48 54 676 712 780 858 865 877 889 892 903 912 913 914 915 916 917 923 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 949] );
opts = fitoptions( 'Method', 'LinearLeastSquares' );
opts.Exclude = excludedPoints;
% Fit model to data.
[fitresult{1}, gof(1)] = fit( xData, yData, ft, opts );
% Plot fit with data.
figure( 'Name', 'december 2012' );
plot( fitresult{1}, xData, yData, excludedPoints );
% Label axes
xlabel( 'x_dec_12_s', 'Interpreter', 'none' );
ylabel( 'Price_dec_12_s', 'Interpreter', 'none' );
grid on
%% Fit: 'december 2013'.
[xData, yData] = prepareCurveData( x_dec_13_s, Price_dec_13_s );
% Set up fittype and options.
ft = fittype( 'poly6' );
excludedPoints = excludedata( xData, yData, 'Indices', [3 4 7] );
opts = fitoptions( 'Method', 'LinearLeastSquares' );
opts.Exclude = excludedPoints;
% Fit model to data.
[fitresult{2}, gof(2)] = fit( xData, yData, ft, opts );
% Plot fit with data.
figure( 'Name', 'december 2013' );
plot( fitresult{2}, xData, yData, excludedPoints );
% Label axes
xlabel( 'x_dec_13_s', 'Interpreter', 'none' );
ylabel( 'Price_dec_13_s', 'Interpreter', 'none' );
grid on