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dti (version 0.6-0)

extract-methods: Methods for Function `extract' and `[' in Package `dti'

Description

The methods extract and/or compute specified statistics from object of class "dtiData", "dtiTensor", and "dtiIndices". This can be restricted to a subset of voxel.

Usage

## S3 method for class 'dtiData':
extract(x, what="data", xind, yind, zind)
  ## S3 method for class 'dtiTensor':
extract(x, what="tensor", xind, yind, zind)
  ## S3 method for class 'dtiIndices':
extract(x, what=c("fa","andir"), xind, yind, zind)
  ## S3 method for class 'dtiData':
[(x, i, j, k, drop=FALSE)
  ## S3 method for class 'dtiTensor':
[(x, i, j, k, drop=FALSE)
  ## S3 method for class 'dtiIndices':
[(x, i, j, k, drop=FALSE)

Arguments

x
Object of class dti
i
vector of x-coordinates, defaults to whole range.
j
vector of y-coordinates, defaults to whole range.
k
vector of z-coordinates, defaults to whole range.
xind
vector of x-coordinates, defaults to whole range.
yind
vector of y-coordinates, defaults to whole range.
zind
vector of z-coordinates, defaults to whole range.
what
Statistic to extract. See Methods Section for details.
drop
unused.

Value

  • For function extract a list with components carrying the names of the options specified in argument what. For indexing function, the cutted object.

See Also

dtiData, dtiTensor, dtiIndices