riverdistanceseq {riverdist} | R Documentation |
River Distance Between Sequential Observations
Description
Returns a matrix of distances traveled by unique fish, between sequential surveys. A plotting method is also provided for the output; see plotseq
Usage
riverdistanceseq(
unique,
survey,
seg,
vert,
rivers,
logical = NULL,
stopiferror = TRUE,
algorithm = NULL
)
Arguments
unique |
A vector of identifiers for each fish. |
survey |
A vector of identifiers for each survey. It is recommended to use a numeric or date format (see as.Date) to preserve survey order. |
seg |
A vector of river locations (segment component). |
vert |
A vector of river locations (vertex component). |
rivers |
The river network object to use. |
logical |
A boolean vector that can be used for subsetting. If used,
|
stopiferror |
Whether or not to exit with an error if a route cannot be
found. If this is set to |
algorithm |
Which route detection algorithm to use ( |
Value
A data frame of distances (numeric), with rows defined by unique fish and columns defined by observation increment (1 to 2, 2 to 3, etc.)
Note
Building routes from the river mouth to each river network segment and/or distance lookup tables will greatly reduce computation time (see buildsegroutes).
Author(s)
Matt Tyers
See Also
Examples
data(Gulk, fakefish)
riverdistanceseq(unique=fakefish$fish.id, survey=fakefish$flight,
seg=fakefish$seg, vert=fakefish$vert, rivers=Gulk)
seqbysurvey <- riverdistanceseq(unique=fakefish$fish.id, survey=fakefish$flight.date,
seg=fakefish$seg, vert=fakefish$vert, rivers=Gulk)
seqbysurvey
plotseq(seqbysurvey)