This is a portion of R.A. Fisher's Iris Flower Data set, for classifying iris
species based on plant measurements. The first four X columns are petal
length, petal width, sepal length, and sepal width, and the last column is the
species Y (0=seotsa, 1=virginica).
To load into Matlab for logistic regression, do the following:
iris=csvread('iris.data');
X=iris(:,1:4);
Y=iris(:,5)