R help - Mar 2014 - How to split a Spell Data Frame into long format (irregular episode length)

Dear R-Users and developers,

I am used to work with singular data but now I have to get my data of an
spell-data-frame conducted in a big German longitudinal survey.

The data structure is:
persnr	spelltyp	begin	end
xf105	10	1	5
xf105	1	6	15
xf106	4	7	12
xf106	7	13	15
xf106	1	16	20

The variable "spelltyp" means a type of employment, 1 meaning
full-time-employment, 4 meaning small part-time employment and so on. The
begin and end are months, beginning with the first month of survey data
collection as 1 (goes up to month 340).

My goal is to transform it into a long-format file such as
persnr	spelltyp 	month
xf105	10	1
xf105 	10	2
xf105	10	3
xf105	10	4
xf105	10	5
xf105	1	6
xf105	1	7
xf105	1	8
xf105	1	9
xf105	1	10
xf105	1	11
xf105	1	12
xf105	1	13
xf105	1	14
xf105	1	15
xf106	4	7
xf106	4	8
xf106	4	9
xf106	4	10
xf106	4	11
xf106	4	12
xf106	7	13
xf106	7	14
xf106	7	15
xf106	1	16
xf106	1	17
xf106	1	18
xf106	1	19
xf106	1	20

So what I want to do with R is to write a new row for every month and create
a new variable where the number of the month is written in (one could keep
the variables begin and end). 

Later on I want to reshape it into I wide-format to perform a sequence
analysis.

I am grateful for any advise - Thanks!



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