Displaying 3 results from an estimated 3 matches for "fish_id".
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dish_id
2010 Mar 17
2
How can I return rows from a data frame with maximum value by factor?
Hi,
I'm new to R and new to this forum. I'm struggling with trying to extract
certain rows of data from my data.frame. The data.frame has eleven columns.
Among those columns are "FISH_ID" and "DATE_TIME". FISH_ID is a factor. For
each of my 21 unique FISH_IDs (levels) I have a few to a few thousand rows,
each row with a unique DATE_TIME value. I would like to obtain, for each
FISH_ID, the entire record from the data.frame with the latest DATE_TIME
value (i.e. max (DA...
2010 Sep 23
4
plotting multiple animal tracks against Date/Time
Dear list,
I would like to create a time series plot in which the paths of several individuals are stacked above each other, with the x-axis being the total observation period of three years ( 1.1.2004 to 31.12.2007) and the y-axis being some defined range[min,max].
My data consist of Date/Time information and the paths of 45 individual as the distance from the location of release. An example
2012 Jan 25
0
adehabitatLT -- movement based kernel density
...ween two locations based on known movement parameters, or at least explore the idea. However, I am not sure how to proceed. Below is an example of the type of data I am working with.
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I would be grateful for some thoughts or suggstions.
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Regards,
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Juliane
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?????? X?????? Y????????? ID VR2 ????Fish_ID??????????????? Date VR2????Number Habitat
2 345481 3020908? 21 BPN??? 1646 2006-08-18 08:51:27??????? 31??? pass??
3 345481 3020908? 22 BPN??? 1646 2006-08-18 08:52:05??????? 31??? pass??
4 345481 3020908? 24 BPN??? 1646 2006-08-18 08:53:20??????? 31??? pass??
5 345481 3020908? 43 BPN??? 1646 2...