Data Set with multiple markers, how do I get the legend to display this?

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CAM 2015-8-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/233356-data-set-with-multiple-markers-how-do-i-get-the-legend-to-display-this

评论： Jon 2015-8-12

I have a data set I've been playing with that has low energy observations and high energy observations. I was wanting to display the low energy data with the '*', and the high energy data with the '^'.

Here's the code I've got:

function [fitresult, gof] = createFit1(xdata1, ydata1)
HeliumData_Voyager
%CREATEFIT1(XDATA1,YDATA1)
%  Create a fit.
%
%  Data for 'untitled fit 1' fit:
%      X Input : xdata1
%      Y Output: ydata1
%  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 11-Aug-2015 22:20:58
%%Fit: 'untitled fit 1'.
[xData, yData] = prepareCurveData( xdata1, ydata1 );
% Set up fittype and options.
ft = fittype( '1/(a*(x)^b+c*(x)^d+e*(x)^f)', 'independent', 'x', 'dependent', 'y' );
opts = fitoptions( 'Method', 'NonlinearLeastSquares' );
opts.Algorithm = 'Levenberg-Marquardt';
opts.Display = 'Off';
opts.Robust = 'Bisquare';
opts.StartPoint = [0.5 0.165607687252584 0.777847540631553 0.913375856139019 0.63235924622541 0.0975404049994095];
% Fit model to data.
[fitresult, gof] = fit( xData, yData, ft, opts );
% Plot fit with data.
figure( 'Name', 'untitled fit 1' );
h1 = plot(fitresult, xData(1:14), yData(1:14),'*');
hold on
h2 = plot(fitresult, xData(15:27), yData(15:27), '^');
hold off 
hold on 
h3 = plot(fitresult);
set(gca,'XScale','log')
set(gca,'YScale','log')
axis([.001,100,.00001,20])
legend( h1, 'Voyager Data', 'Line of Best Fit', 'Location', 'SouthWest' );
% Label axes
title('Low and High Energy Cosmic Ray Spectra for Helium')
xlabel('Energy (GeV)')
ylabel('Flux particle m^{-2}s^{-1}sr^{-1}MeV')
grid on

You probably don't need the data set for this question, but for good measure:

xdata1 = [0.0021859258,0.0035637526,0.0049688127,0.007943902,0.012700333,...
020705573,0.032462176,0.04615445,0.059510704,0.098936856,0.19612777,...
2899725,0.381267,0.5013045,12.45768,12.954449,15.1476755,14.378171,...
712223,19.658836,20.982672,22.395653,30.620895,24.856985,27.95077,...
1117,35.805107];
ydata1 = [2.17084,1.5341274,1.6444274,2.4091163,2.025231,2.673546,2.7679887,...
5823257,2.3269181,1.8893886,1.3352263,0.8803091,0.5803841,0.42464474,...
8200923E-4,3.8242337E-4,2.194412E-4,2.9647112E-4,1.8235153E-4,...
3813264E-4,1.0463649E-4,8.496173E-5,4.1460968E-5,6.144804E-5,...
875252E-5,3.2894895E-5,2.5501544E-5];

And I'll attach the graph, where you can see I've already got the stars and triangles. However, I can't get the legend to show both types of markers. I want the stars to say Voyager Data, and the triangles to say Pamela Data.

I've tried the following:

legend( [h1,h2], 'Voyager Data', 'Pamela Data', 'Line of Best Fit', 'Location', 'SouthWest' );

However, that didn't work. How can I accomplish this?

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Answer 1

Jon 2015-8-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/233356-data-set-with-multiple-markers-how-do-i-get-the-legend-to-display-this#answer_189031

在 MATLAB Online 中打开

Why are you including 'fitresult' in your plotting commands? See if this code does what you want:

function [fitresult, gof] = createFit1(xdata1, ydata1)
% HeliumData_Voyager
%CREATEFIT1(XDATA1,YDATA1)
%  Create a fit.
%
%  Data for 'untitled fit 1' fit:
%      X Input : xdata1
%      Y Output: ydata1
%  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 11-Aug-2015 22:20:58
%%Fit: 'untitled fit 1'.
[xData, yData] = prepareCurveData( xdata1, ydata1 );
% Set up fittype and options.
ft = fittype( '1/(a*(x)^b+c*(x)^d+e*(x)^f)', 'independent', 'x', 'dependent', 'y' );
opts = fitoptions( 'Method', 'NonlinearLeastSquares' );
opts.Algorithm = 'Levenberg-Marquardt';
opts.Display = 'Off';
opts.Robust = 'Bisquare';
opts.StartPoint = [0.5 0.165607687252584 0.777847540631553 0.913375856139019 0.63235924622541 0.0975404049994095];
% Fit model to data.
[fitresult, gof] = fit( xData, yData, ft, opts );
% Plot fit with data.
figure( 'Name', 'untitled fit 1' )
hold on
plot( xData(1:14), yData(1:14), '*');
plot( xData(15:27), yData(15:27), '^');
plot(fitresult);
set(gca,'XScale','log')
set(gca,'YScale','log')
axis([.001,100,.00001,20])
legend('Voyager Data', 'Pamela Data', 'Line of Best Feet', 'Location', 'SouthWest' );
% Label axes
title('Low and High Energy Cosmic Ray Spectra for Helium')
xlabel('Energy (GeV)')
ylabel('Flux particle m^{-2}s^{-1}sr^{-1}MeV')
grid on

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CAM 2015-8-12

That did it! Thanks!

To answer your first, this is simply a lot of iterations of code, so some things I haven't "cleaned" out just yet since I've been working on this code for some time now.

Thanks for the help!

Jon 2015-8-12