How can I put legend for some of my curves?

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

Answer 1

[Takumi]

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')))

[Fatemeh Alaee]

Thank you so much, Takumi. The part for color works fine, but the legends do not show, there is an error

[Takumi]

Please tell me version you are using and what error occurred .

[Takumi]

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)

[Fatemeh Alaee]

Thank you so much, Now it works fine