How can I put legend for some of my curves?

Question

Fatemeh Alaee 2020-7-16

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https://ww2.mathworks.cn/matlabcentral/answers/566160-how-can-i-put-legend-for-some-of-my-curves

评论： Fatemeh Alaee 2020-7-17

Hi, I've plotted two functions in one plot, in which each function is plotted based on different amount of "p" , i.e. there are 6 numbers for "p", for each function, and I have 12 curves in a plot. The point is my functions are "y1=f(x)" and "y2=-f(x)" , and every pair of functions ( y1, y2) has the same p. Is there a way that I can introduce each pair of curves with one "p" in legend? And those pair which has the same p, plot with the same color? Thank you in advance

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Answer 1

Takumi 2020-7-16

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https://ww2.mathworks.cn/matlabcentral/answers/566160-how-can-i-put-legend-for-some-of-my-curves#answer_466764

在 MATLAB Online 中打开

I created a example code.

col = [0  ,0  ,0;
       255,0,  0  ;
       0,  255,0  ;
       0,  0,  255;
       255,255,0  ;
       0,  255,255]./255;   % color array
func = @(x,p) p*sqrt(x);    % some function
x = linspace(0,10);
p = 1:6;    % some factor
y = zeros(length(p),length(x));
for i=1:length(p)
    y(i,:) = func(x,p(i));
    plot(x,y(i,:),'Color',col(i,:));    % +function
    hold on
    plot(x,-y(i,:),'Color',col(i,:),'HandleVisibility','off');  % -function, legend is not shown
end
legend(strcat('p=',num2str(p')))

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Takumi 2020-7-17

编辑：Takumi 2020-7-17

在 MATLAB Online 中打开

How about this way?

col = [0  ,0  ,0;
       255,0,  0  ;
       0,  255,0  ;
       0,  0,  255;
       255,255,0  ;
       0,  255,255]./255;   % color array
func = @(x,p) p*sqrt(x);    % some function
x = linspace(0,10);
p = 1:6;    % some factor
y = zeros(length(p),length(x));
for i=1:length(p)
    y(i,:) = func(x,p(i));
    s(i) = plot(x,y(i,:),'Color',col(i,:),'DisplayName',sprintf('p=%2.1f',p(i)));    % +function
    hold on
    plot(x,-y(i,:),'Color',col(i,:));
end
legend(s)