How to obtain legend with tex equation and the value of an output variable?

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Hlib Cheporniuk
Hlib Cheporniuk 2019-5-13
评论： Hlib Cheporniuk 2019-5-13
Hi, I am running R2018b and trying to obtain a nice subplot with tex interpreted legend, which also have to display an output variable XAbsFinal
Here is my piece of code:
subplot(3,2,2)
hold on, grid on
pl1=line(1:n, XAbs, 'Color', 'b');
pl2=line(l(1,end), X(1,end),'Color', 'b', 'Marker', 's', 'MarkerSize', 8, 'LineWidth', 2);
set(gca, 'XAxisLocation','top','YAxisLocation','left','XLim',[0 n]);
leg1=legend([pl1,pl2], {'$\Delta|X_{E}|$', sprintf('$\Delta|X_{E}|_{final}$ at %0.4f [m]$ ',XAbsFinal), 'Interpreter', 'tex'})
set(leg1,'Location', 'NorthWest', 'Interpreter','latex','FontSize', 10);
ay = gca;
ay_pos=ay.Position; %position of first axes
ay.YRuler.Exponent = 0;
ay.XRuler.Exponent=0;
ylabel (ay, 'Extremum [m]');
text(-0.1,1.15,'d).','Units', 'Normalized', 'VerticalAlignment', 'Top');
ay2=axes('Position',ay_pos, 'XAxisLocation','bottom','YAxisLocation','left','Color', 'none', 'XLim',[0 n_days]);
ay2.YRuler.Color='none';
And here is the result:
I'd like to have \Delta|X_{E}|_{final} = XAbsFinal as the second piece of my legend, but I feel like I am missing something concerned the usage of sprintf and tex syntax, while first part of the line
leg1=legend([pl1,pl2], {'$\Delta|X_{E}|$', sprintf('$\Delta|X_{E}|_{final}$ at %0.4f [m]$ ',XAbsFinal), 'Interpreter', 'tex'})
works fine and provide me with an expected notation for the first piece of my legend.
Thank you in advance for your help!
Cheers,
Hlib

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采纳的回答

Walter Roberson
Walter Roberson 2019-5-13
leg1=legend([pl1,pl2], {'$\Delta|X_{E}|$', sprintf('$\\Delta|X_{E}|_{final}$ at %0.4f [m]$ ',XAbsFinal), 'Interpreter', 'tex'})
You missed that \ is a special character for sprintf purposes. See "Text Before or After Formatting Operators in the sprintf documentation. \a, \b, \f, \n, \r, \t, \v, \x####, \### all having defined meanings.

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