how to change the data from numeric to category in dataset using matlab

Hi Matlab Expert,

I am doing the classification analysis using matlab, in the final result i want to convert the numeric to category, actually this is very simple but I am still no finding how to code this.

For example, let I have dataset named as data.mat contains only 1 column with range 1-4:

 %
1
1
1
1
2
2
2
3
3
3
4
4
4

I want to add additional column with category: if 1=good, 2=meddium , 3=bad 4=very bad, so the result should be like this:

 %
1  good
1  good
1  good
1  good
1  good
2  medium
2  medium
2  medium
3  bad
3  bad
3  bad
4  very bad
4  very bad
4  very bad

Please help me how to code this in matlab? thanks!

Answer 1

[Image Analyst]

Try this:

% Initialize/setup:
m = [1,1,1,1,2,2,2,3,3,3,4,4,4]
categories = {'good', 'medium', 'bad', 'very bad'}

% Get a list of what categories that the elements of m are.
mCategories = categories(m)

Also, please read the FAQ on cell arrays http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F and Accept the Answer if it answers your question.

[PsychoMath]

Thanks guys!.