Transform into a sequence object with numerical alphabet.

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Description

The function seqnum transforms the provided state sequence object into an equivalent sequence object in which the original alphabet is replaced with an alphabet of numbers ranging from 0 to (nbstates-1).

Usage

1
 seqnum(seqdata, with.missing=FALSE)

Arguments

seqdata

a state sequence object as defined by the seqdef function.

with.missing

logical: Should missing elements in the sequences be turned into numerical values as well? The code for missing values in the sequences is retrieved from the 'nr' attribute of seqdata.

Details

The first state (for example 'A') is coded with the value 0, the second state (for example 'B') is coded with the value 1, etc... The function returns a sequence object containing the original sequences coded with the new numerical alphabet ranging from 0 to (nbstates-1)

Author(s)

Alexis Gabadinho

See Also

seqdef, alphabet

Examples

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data(actcal)
actcal.seq <- seqdef(actcal,13:24)

## The first 10 sequences in the actcal.seq
## sequence object
actcal.seq[1:10,]
alphabet(actcal.seq)

## The first 10 sequences in the actcal.seq
## sequence object with numerical alphabet
seqnum(actcal.seq[1:10,])

## states A,B,C,D are now coded 0,1,2,3
alphabet(seqnum(actcal.seq))

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