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How to create legend for two error bar plots

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Nicholas Pfaff
Nicholas Pfaff 2018-7-11
编辑： dpb 2018-7-12
The only problem with my code is, that the legend line gives error messages and doesn't show up in the graph. I want a legend with 4 elements (The data of graph 1, the fit of graph 1, the data of graph 2, the fit of graph 2). I don't want the error bars to show in the legend. My code:
function [fitresult, gof, goft] = Linearized_plot_both(inverse_square_radius,time,er,inverse_square_radiust,timet,ert)
%%Fit: 'Linearized Fit'.
[xData, yData] = prepareCurveData( inverse_square_radius, time );
[xDatat, yDatat] = prepareCurveData( inverse_square_radiust, timet );
% Set up fittype and options.
ft = fittype( 'poly1' );
% Fit model to data.
[fitresult, gof] = fit( xData, yData, ft );
[fitresultt, goft] = fit( xDatat, yDatat, ft );
% Plot fit with data.
figure( 'Name', 'Comparing Linearized Fit' );
x= linspace(0,11e5);
y=(fitresult.p1).*x + (fitresult.p2);
h=plot(xData,yData,'.k',x,y,'b');
h(1).MarkerSize = 12;
h(2).LineWidth = 1;
hold on;
axis([0 10.5e5 0 41.5]);
grid on;
hEB=errorbar(xData,yData,er,'.k', 'MarkerFaceColor','k','MarkerEdgeColor','k','MarkerSize',12);
xt= linspace(0,11e5);
yt=(fitresultt.p1).*x + (fitresultt.p2);
ht=plot(xDatat,yDatat,'.k',xt,yt,'r');
ht(1).MarkerSize = 12;
ht(2).LineWidth = 1;
hold on;
hEBt=errorbar(xDatat,yDatat,ert,'.k', 'MarkerFaceColor','k','MarkerEdgeColor','k','MarkerSize',12);
legend([h,ht],'time vs. inverse_square_radius (Data)','Linearized Fit (Data)','time vs. inverse_square_radius (Theory)','Linearized Fit (Theory)');
% Label axes
xlabel inverse_square_radius
ylabel time
The produced graph:
Way I want my legend to look (just for both graphs):
%
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dpb
dpb 2018-7-11
Please attach a mat or text file with the variables. Help us help you...

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采纳的回答

dpb
dpb 2018-7-12
编辑：dpb 2018-7-12
h and ht are column vectors of handles and you've concatenated them into a 2x2 array instead of a vector...it's trying to put those together inside legend that's failing.
Use ; instead of , --
legend([h;ht],'time vs. inverse_square_radius (Data)','Linearized Fit (Data)','time vs. inverse_square_radius (Theory)','Linearized Fit (Theory)');
You'll probably cover up most of the plot area with the length of the text, but that's another problem... :)
  2 个评论
dpb
dpb 2018-7-12
编辑：dpb 2018-7-12
legend documents subset handles input must be a vector but seems rude for it to fail unceremoniously; it couldn't cost anything for it to use (:) on the argument inside to ensure is a vector or, failing that, inform of the what the error is during input check...
I didn't catch it just reading the code; set breakpoint in editor to see what you ended up with (hence the request for sample or data to run yours; almost certainly if had tried to emulate I'd have missed the crucial mistake and not found the problem).
ADDENDUM
I did submit enhancement SRQ to either add informative error or, it turns out that one can modify the failing line by the (:) and it will then accept the array of handles. I made the patch and recompiled the p-code and with that the existing code runs to completion with the expected result. No big deal but even an informative error would be better than the crash inside TMW-supplied function with no guidance as to why.

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