Re: [R] modify and append new rows to a data.frame using ddply

On 10-06-2013, at 11:49, Santiago Guallar wrote: > Hi, > > I have a data.frame that contains a variable act which records the duration > (in seconds) of two states (wet-dry) for several individuals (identified by > Ring) over a period of time. Since I want to work with daytime (i.e. from > s

[R] modify and append new rows to a data.frame using ddply

Hi, I have a data.frame that contains a variable act which records the duration (in seconds) of two states (wet-dry) for several individuals (identified by Ring) over a period of time. Since I want to work with daytime (i.e. from sunrise till sunset) and night time (i.e. from sunset till next s