how to convert a numeric variable into categorical variable in matlab

i have a normalized numeric vector which ranges between -1 and +1. i want to use this as a response variable in my classification learner which requires conversion into a categorical variable. i would like to have 3 categories - < 0, 0-0.5, > 0.5. Kindly help me with a matlab code.

Answer 1

[Guillaume]

The first line of the documentation of categorical says: "To group numeric data into categories, use discretize." So:

x = rand(1, 20) * 2 - 1;  %random numbers between -1 and 1
y = discretize(x, [-1 0 0.5 1], 'categorical')