MATLAB - Directly convert nominal data to numeric

Question

Is there any Matlab function to directly convert nominal data to numeric one ?

N.b that currently, and after several searches, I use NumericGroup=str2num(char(NominalGroup))

Thanks,

@amadeus: In fact, it's not what I want. `containers.Map` doesn't convert **directly**, in addition, it requires a second argument which is assumed unknown, rather that's what we seek to determine ! — Sofiane, Dec 27 '13 at 00:10

score 2 · Accepted Answer · answered Dec 26 '13 at 23:53

2

double(NominalGroup) will convert a nominal/categorical array to a double array.

answered Dec 26 '13 at 23:53

Jonas

score 1 · Answer 2 · answered Jan 27 '15 at 17:19

1

Using the double function is dangerous because it returns the category index of the NominalValue.

Example:

color = categorical({'8','9','0'})
x = color(1)  % x = 8
z = double(x) % z = 2

I have been loking for a function that gives me z = 8.

answered Jan 27 '15 at 17:19

Djan

2 Answers2