Drawing a discrimination line

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Raviteja
Raviteja 2012-2-10
编辑： Yiming 2013-10-8
Hello,Please help me..
I want to understand how "classify" funtion works in matlab. So I have written a code below.
load fisheriris
% Taken only two classes...so I removed 'virginica' class
d=strcmp(species,'virginica');
i=find(d==1);
meas(i,:)=[];
species(i,:)=[];
% Create Data and labels (Considered 2 dimension data)
data = [ meas(1:end,3) meas(1:end,4)];
group = species;
% Divided data as training and testing
train_data=data(16:83,:);
train_label=group(16:83,:);
test_data=[data(1:15,:);data(84:end,:)];
clas=classify(test_data,train_data,train_label)
plot(data(:,1),data(:,2),'.')
hold on
plot(test_data(:,1),test_data(:,2),'.r');
the funtion classify by default perform "Linear Discriminant". Here I want to draw a discriminant line in the plot.
Can you please any one help me in this?
  1 个评论
Raviteja
Raviteja 2012-2-10
Ok,I written this, and it is working....
K = str(1,2).const;
L = str(1,2).linear;
f = @(x,y) K+L(1)*x + L(2)*y;
ezplot(f,[1 6 0 2]);
hold off
title('Classification of Fisher iris data')
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