Extract permutation matrix associated with an image
Source:R/all_generic.R
, R/axis.R
perm_mat-methods.Rd
A permutation matrix defines how the native voxel coordinates can be transformed to standard (LPI) orientation.
Usage
perm_mat(x, ...)
# S4 method for AxisSet2D
perm_mat(x, ...)
# S4 method for AxisSet3D
perm_mat(x, ...)
# S4 method for NeuroSpace
perm_mat(x, ...)
Details
a permutation matrix can be used to convert between cardinal image orientations. For example, if an image is stored in "RPI" (Right-Posterior-Inferior) format, a coordinate in this space can be converted to LPI (Left-Posterior-Inferior) by multiplying a coordinate vector by the permutation matrix.