| extract-methods {dti} | R Documentation |
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.
## S4 method for signature 'dtiData':
extract(x, what="data", xind=TRUE, yind=TRUE, zind=TRUE)
## S4 method for signature 'dtiTensor':
extract(x, what="tensor", xind=TRUE, yind=TRUE, zind=TRUE)
## S4 method for signature 'dtiIndices':
extract(x, what=c("fa","andir"), xind=TRUE, yind=TRUE, zind=TRUE)
## S4 method for signature 'dwiQball':
extract(x, what="sphcoef", xind=TRUE, yind=TRUE, zind=TRUE)
## S4 method for signature 'dtiData':
x[i, j, k, drop=FALSE]
## S4 method for signature 'dtiTensor':
x[i, j, k, drop=FALSE]
## S4 method for signature 'dtiIndices':
x[i, j, k, drop=FALSE]
## S4 method for signature 'dwiQball':
x[i, j, k, drop=FALSE]
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. |
For function extract a list with components carrying the names of the options specified in
argument what. For indexing function, the cutted object.
"[" does what it is expected to do: it extracts parts of the object specified by i, j, and k.
extract. Generic funtion for "[" returns an object of same class with data clipped to the indices specified in arguments i, j and k.i, j and k.what. Information is extracted for voxel within the cube defined by xind, yind, and zind. what. Information is extracted for voxel within the cube defined by arguments xind, yind and zind. what. Information is extracted for voxel within the cube defined by arguments xind, yind and zind.
Karsten Tabelow tabelow@wias-berlin.de
J"org Polzehl polzehl@wias-berlin.de
dtiData,
dtiTensor,
dtiIndices
dwiQball