Use a cell array in for loop for selectively labeling plots

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Marco 2019-4-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/457855-use-a-cell-array-in-for-loop-for-selectively-labeling-plots

编辑： Marco 2019-4-22

Hi, I have some experimental data and linear fits which I would like to plot on one figure by means of a for loop:

nu = [10, 20, 50, 100, 200, 300, 400, 500, 600]; %scan rate in mV/s
%Solvent: toluene (tol)
i_p_a_tol = [3.14, 7.16, 17.91, 33.41, 57.38, 76.42, 91.14, 102.24, 113.95]; % peak anodic current (microA)
i_p_c_tol = [-3.26, -7.40, -19.00, -36.52, -66.88, -92.13, -112.5, -128.02, -142.96]; % peak cathodic current (microA)
%Solvent: ethanol (etoh)
i_p_a_etoh = [3.33, 3.85, 6.11, 8.31, 11.4, 13.57, 14.66, 14.93, 17.85];
i_p_c_etoh = [-3.35, -4.79, -9.51, -13.41, -18.03, -20.66, -23.12, -23.35, -24.15];
%Solvent: acetonitrile (mecn)
i_p_a_mecn = [2.40, 5.01, 12.41, 21.82, 37.24, 50.11, 57.66, 63.84, 71.05];
i_p_c_mecn = [-2.43, -5.12, -13.03, -24.61, -44.93, -62.11, -73.38, -81.34, -90.36];
i_p_a = [i_p_a_tol; i_p_a_mecn; i_p_a_etoh];
%Fitted curves: 
p1 = zeros(3,2);
p2 = zeros(3,2);
nu_plot = [10:1:700];
for i = 1:3
    p1(i,:) = polyfit(nu, i_p_a(i,:), 1);
    i_p_a_fit(i,:) = polyval(p1(i,:), nu_plot);
end
%Create a default color map
n = 8;
color_map = parula(n);
solvent_list_cell = {'Toluene', 'MeCN', 'EtOH'};
%Plots:
figure(1)
for i = 1:3
    scatter(nu, i_p_a(i,:),'MarkerEdgeColor',color_map(i,:),'MarkerFaceColor',color_map(i,:)); hold on
    plot(nu_plot, i_p_a_fit(i,:),'--','Color',color_map(i,:),'LineWidth',0.75); hold on
    scatter(nu, i_p_c(i,:),'MarkerEdgeColor',color_map(i,:),'MarkerFaceColor',color_map(i,:)); hold on
    plot(nu_plot, i_p_c_fit(i,:),'--','Color',color_map(i,:),'LineWidth',0.75); 
end
xlabel('\nu (mV s^{-1})','FontSize', 16)
ylabel('{\iti_{p}} (\muA)','FontSize', 16)

What I would like to do is add a legend to this figure. However, out of the 4 plots plotted within the for loop, I would only like the first scatter plot to be inlcuded in the legend; also I would like the legend to include the three solvent names shown in:

solvent_list_cell

How can I go about this please? Is it better not to have the list that is to be inluced in the legend within an array?

I am using Matlab 2016a. But if recommeneded, I have the chance to upgrade to the 2019 version.

Thanks.