Problem with legend in a plot

Hey.

I have some problems using legend in a plot. I have 2 plots where the first one has dots and the second one is a line plot. When I use legend it somehow shows dots for both plots when it has to show dots for the first plot and a line for the second.

Can anyone help me with this?

I have written the following:

Legend = cell(2,1);
Legend{1} = 'Plot1';
Legend{2} = 'Plot2';
legend(Legend{:});

Thank you!

Answer 1

[Thorsten]

h(1) = plot(x, sin(x), ':')
hold on
h(2) = plot(x, cos(x), '-')
legend(h, {'sin', 'cos'})

Answer 2

[m m]

I have the second plot(plot2) in an if-statement:

if max(size(A)) ~= 1
  plot2 = plot(x,A,'r-');
end

Answer 3

[PChoppala]

An example (although there are better ways of doing it),

 n=50;
 x=linspace(1/n,1,n);
 y1=sin(4*pi*x);
 y2=cos(4*pi*x(10:30)); % for example

 figure
 plot(x,y1,'b.','markersize',10)
 grid on
 if numel(y2)>1,
    hold on
    plot(x(10:30),y2,'color',[1 0 0],'linewidth',1.5)
    legend('sine','cosine')
 else
  legend('sine')
 end

[Mike Garrity]

Yes, or another option would be the following:

n=50;
x=linspace(1/n,1,n);
y1=sin(4*pi*x);
y2=cos(4*pi*x(10:30)); % for example
figure
plot(x,y1,'b.','MarkerSize',10,'DisplayName','sine')
grid on
if numel(y2)>1
  hold on
  plot(x(10:30),y2,'Color',[1 0 0], ...
       'LineWidth',1.5,'DisplayName','cosine')
end
legend show

The 'legend show' will pick up the strings from the DisplayName properties of the objects it finds in the axes. This can be useful if you have a large number of plots and complex conditionals.