CODEWITHSUNDEEP
matlabfigure
Fantastic Mr Fox
Fantastic Mr Fox

Reputation: 33944

Change Legend diagram in matlab

I have some code that basically does this:

for i = 1:length(ReliabilityStruct)
    if (FailureFlags(i) == 0) 
        plot(X(i), Y(i), '.b');
    elseif (FailureFlags(i) == 1)
        plot(X(i), Y(i), 'or');
    elseif (FailureFlags(i) == 2)
        plot(X(i), Y(i), 'og');
    elseif (FailureFlags(i) == 3)
        plot(X(i), Y(i), 'ok');
    else
        fprintf('\nUnknown Flag, check Data\n')
        return
    end
end
drawnow;
legend('Recovery', '1', '2', '3');

So my aim is to make a graph that has different symbols for different flags. See below:

enter image description here

As you can see, the Legend doesn't exactly fit the data. How can you change each of the legend entries to fix this up? Alternatively, is there a better way to approach this?

Upvotes: 0

Views: 186

Answers (3)

Chunliang Lyu
Chunliang Lyu

Reputation: 1760

Remember that you can refer to the usage for any function using help command. For your case, the help legend will give you usage examples like following.

legend(H,string1,string2,string3, ...) puts a legend on the plot
containing the handles in the vector H using the specified strings as
labels for the corresponding handles.

Thus, you can get the plot handler by assign the plot to a variable, such as p1=plot(X(i), Y(i), '.b');. And then draw the legend by invoke the command with handlers as first parameter, like legend([p1], 'something').

Upvotes: 1

ThijsW
ThijsW

Reputation: 2599

I think you can use something like this (added bonus is that you avoid loops!):

ind = FailureFlags==0;
plot(X(ind), Y(ind), '.b');

ind = FailureFlags==1;
plot(X(ind), Y(ind), 'or');

ind = FailureFlags==2;
plot(X(ind), Y(ind), 'og');

ind = FailureFlags==3;
plot(X(ind), Y(ind), 'ok');

legend('Recovery', '1', '2', '3');

Upvotes: 3

johnish
johnish

Reputation: 390

Give this a try. In your loop make an assignment for each plot as follows:

 p1=plot(X(i), Y(i), '.b');
elseif (FailureFlags(i) == 1)
 p2=plot(X(i), Y(i), 'or');
elseif (FailureFlags(i) == 2)
 p3=plot(X(i), Y(i), 'og');
elseif (FailureFlags(i) == 3)
 p4=plot(X(i), Y(i), 'ok');

Then you can use legend for the specific things:

legend([p1 p2],'stuff','morestuff')

Upvotes: 1

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