Having trouble with legend

Question

Carly Hudson 2020-5-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/524722-having-trouble-with-legend

回答： Marco Riani 2020-5-11

Here is my code:

%Line Colors
strColor = {'-r','-g','-b'};
%Legend String
strLegend = {'nSamples = 5','nSamples = 10','nSamples = 15'};
for k = 1:length(n)
    %sample values
    newX = linspace(xpts(1),xpts(end),n(k));
        
    subplot(1,3,k);
    hold on
    
    %Creating coefficients with polyfit
    p = interp1(xpts,ypts,newX,'spline'); 
    %Plotting x and y values as blue dots
    plot(xpts,ypts,'ko','MarkerFaceColor','k','MarkerSize',4); 
    hold on
    %Lines
    plot(newX,p,strColor{k});
    hold on
    
    %legend('Data',strLegend(k));
    subplot(1,3,k);
    legend('Data',strLegend(k));
    
    
    %Labeling graph
    title('Plotting with polyfit and polyval');
end

I am attempting to plot 'Data' for the black dots and the strLegend for the colored line on the legend. Right now it is only plotting the strLegend in legend, and it is saying they are the black dots.

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Answer 1

Peng Li 2020-5-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/524722-having-trouble-with-legend#answer_431854

编辑：Peng Li 2020-5-11

Try this

%Line Colors
strColor = {'-r','-g','-b'};
%Legend String
strLegend = {'nSamples = 5','nSamples = 10','nSamples = 15'};
for k = 1:length(n)
    %sample values
    newX = linspace(xpts(1),xpts(end),n(k));
        
    subplot(1,3,k);
    hold on
    
    %Creating coefficients with polyfit
    p = interp1(xpts,ypts,newX,'spline'); 
    %Plotting x and y values as blue dots
    p2 = plot(xpts,ypts,'ko','MarkerFaceColor','k','MarkerSize',4); 
    hold on
    %Lines
    p3 = plot(newX,p,strColor{k});
    hold on
    
    %legend('Data',strLegend(k));
%     subplot(1,3,k);
%     legend('Data',strLegend(k));
    legend([p p2 p3], {'Data', 'something', strLegend(k)});
    
    %Labeling graph
    title('Plotting with polyfit and polyval');
end