CODEWITHSUNDEEP
matlabgraphvectorplotlegend
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Reputation: 177

Legend gives too much data in matlab

How can I restrict my legend in Matlab? So far I'm plotting a graph with code like so:

figure;
hold on;
plot(log(X),7.35,'ro',7.35,log(Y),'bo');
axis([7.3 7.7 7.3 7.7]);
set(gca,'xtick',[7:0.1:7.7])
set(gca,'ytick',[7:0.1:7.7])
title('atheism test file 1')
xlabel('x axis'); ylabel('y axis');
legend show;

Where X,Y are column vectors of 10 elements. When I do 'legend show'it will show 10 red circles data 1, data 2 etc. and then 10 blue circles. If I amend this to say legend('red','blue') It just gives me two red circles called red and blue...

What I want is to just take a legend to show 2 items, a red circle and a blue circle that I can name.

Upvotes: 2

Views: 718

Answers (2)

Eitan T
Eitan T

Reputation: 32920

What you're plotting is actually 10 different points for log(X) and 10 different points for log(Y), because for each plot the input vectors for each axis have different sizes. Simply make them to be of the same dimensions, like so:

plot(log(X), 7.35 * ones(size(X)), 'ro', 7.35 * ones(size(Y)), log(Y), 'bo');

and the legend will come out properly. There is no need for hold on here (and no need to store any figure handles).

Upvotes: 3

Memming
Memming

Reputation: 1739

Plot red and blue separately, and then legend them explicitly. Try something like:

ph1 = plot(log(X),7.35,'ro');
ph2 = plot(7.35,log(Y),'bo');
legend([ph1(1), ph2(1)], 'red', 'blue');

Upvotes: 3

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