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mergelevels

(Not Recommended) Merge levels of nominal or ordinal arrays

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The nominal and ordinal array data types are not recommended. To represent ordered and unordered discrete, nonnumeric data, use the Categorical Arrays data type instead.

Syntax

B = mergelevels(A,oldlevels)
B = mergelevels(A,oldlevels,newlevel)

Description

B = mergelevels(A,oldlevels) merges two or more levels of A.

  • If A is a nominal array, mergelevels uses the first label in oldlevels as the new level.

  • If A is an ordinal array, the levels specified by oldlevels must be consecutive, and mergelevels uses the label corresponding to the lowest level in oldlevels as the label for the new level.

B = mergelevels(A,oldlevels,newlevel) merges two or more levels into the new level with label newlevel.

example

Examples

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Open Live Script

Create a nominal array from data in a cell array.

colors = nominal({'r','b','g';'g','r','b';'b','r','g'},...
                 {'blue','green','red'})
colors = 3x3 nominal
     red        blue      green 
     green      red       blue  
     blue       red       green

Merge the elements of the 'red' and 'blue' levels into a new level labeled 'purple'.

colors = mergelevels(colors,{'red','blue'},'purple')
colors = 3x3 nominal
     purple      purple      green  
     green       purple      purple 
     purple      purple      green

Display the levels of colors.

getlevels(colors)
ans = 1x2 nominal
     purple      green

Input Arguments

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Nominal or ordinal array, specified as a nominal or ordinal array object created with nominal or ordinal.

Levels to merge, specified as a string array, cell array of character vectors, or 2-D character array. For ordinal arrays, the levels in oldlevels must be consecutive.

Data Types: char | string | cell

Level to create from the merged levels, specified as a character vector or string scalar that gives the label for the new level.

Data Types: char | string

Output Arguments

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Nominal or ordinal array, returned as a nominal or ordinal array object.

Version History

Introduced in R2007a

See Also

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