Create a categorical array containing various colors.

A = categorical({'red';'blue';'pink';'red';'blue';'red'})

A =6×1 categorical arrayred blue pink red blue red

Ais a 6-by-1 categorical array.

Display the categories ofA.

categories(A)

ans =3×1 cell array'blue' 'pink' 'red'

The three categories are in alphabetical order.

合并类别red和pinkinto the categoryred. Specifyredfirst inoldcatsto use it as the merged category.

oldcats = {'red','pink'}; B = mergecats(A,oldcats)

b =6×1 categorical arrayred blue red red blue red

mergecatsreplaces the valuepinkfromA(3)withred.

Display the categories ofB.

categories(B)

ans =2×1 cell array'blue' 'red'

Bhas two categories instead of three.

Create a categorical array containing various items.

A = categorical({'shirt''pants';'shoes''shirt';'dress''belt'})

A =3×2分类阵列shirt pants shoes shirt dress belt

Display the categories ofA.

categories(A)

ans =5×1 cell array'belt' 'dress' 'pants' 'shirt' 'shoes'

The five categories are in alphabetical order.

合并类别belt和shoesinto a new category calledother.

b =mergecats(A,{'belt''shoes'},'other')

b =3×2分类阵列衬衫裤子其他衬衫连衣裙其他

The valueotherreplaces all instances ofbelt和shoes.

Display the categories ofB.

categories(B)

ans =4×1 cell array'other' 'dress' 'pants' 'shirt'

Bhas four categories and the order is no longer alphabetical.otherappears in place ofbelt.

创建一个顺序的分类阵列。

A = categorical([1 2 3 2 1],1:3,{'poor','公平的','good'},'Ordinal',真正的)

A =1×5分类阵列poor fair good fair poor

Display the categories ofA.

categories(A)

ans =3×1 cell array'poor' 'fair' 'good'

自从Ais ordinal, the categories have the mathematical orderingpoor < fair < good.

Consider allfair或者poorvalues to be坏. SinceAis ordinal, the categories to merge must be consecutive.

b =mergecats(A,{'公平的''poor'},'bad')

b =1×5分类阵列坏坏good bad bad

The value坏replaces all instances offair和poor.

Display the categories ofB.

categories(B)

ans =2×1 cell array'bad' 'good'

Bhas two categories with the mathematical ordering:坏< good.