Can I manipulate the legend?

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Coral Reyes
Coral Reyes 2015-7-13
评论： Star Strider 2015-7-13
The following code will plot me 68 markers. Each marker will have a different color depending on the value of I. Is there a way I can get my legend to show all 5 colors ? For now it is just showing the marker for the first 5 plots, and I just need one per color. If you have any idea or other suggestions that can work as well please let me know.
%for ii=1:1:length(x)
if I(ii)==0;
plot(x(ii), y(ii),'bx','LineWidth',2,'MarkerSize',15)
hold on %attached flow
elseif I(ii)==1;
plot(x(ii), y(ii),'yx','LineWidth',2,'MarkerSize',15)
hold on %energized
elseif I(ii)==2;
plot(x(ii), y(ii),'mx','LineWidth',2,'MarkerSize',15)
hold on %highly energized
elseif I(ii)==3;
plot(x(ii), y(ii), 'rx','LineWidth',2,'MarkerSize',15)
hold on %seperated
else
plot(x(ii), y(ii), 'x','LineWidth',2,'MarkerSize',15)
hold on %incipient
end
%end

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回答（1 个）

Star Strider
Star Strider 2015-7-13
Try this:
L = 100;
I = randi([0 4], 1, L);
x = randn(1,10);
y = randn(1,10);
figure(1)
hold on
for ii=1:1:length(x)
if I(ii)==0;
hl0 = plot(x(ii), y(ii),'bx','LineWidth',2,'MarkerSize',15)
% hold on %attached flow
elseif I(ii)==1;
hl1 = plot(x(ii), y(ii),'yx','LineWidth',2,'MarkerSize',15)
% hold on %energized
elseif I(ii)==2;
hl2 = plot(x(ii), y(ii),'mx','LineWidth',2,'MarkerSize',15)
% hold on %highly energized
elseif I(ii)==3;
hl3 = plot(x(ii), y(ii), 'rx','LineWidth',2,'MarkerSize',15)
% hold on %seperated
else
hl4 = plot(x(ii), y(ii), 'x','LineWidth',2,'MarkerSize',15)
% hold on %incipient
end
end
hold off
legend([hl0, hl1, hl2, hl3, hl4], 'attached flow', 'energized', 'highly energized', 'seperated', 'incipient')
  2 个评论
Coral Reyes
Coral Reyes 2015-7-13
it didn't work . It says
Undefined function or variable 'hl1'
Star Strider
Star Strider 2015-7-13
That simply means that there were no values of I(ii) that were equal to 1. It works if there are — I tested it to be sure.
I don’t have your data, so I can only simulate them and test your code against my simulations.

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