antsTransformPhysicalPointToIndex: Get Index from Spatial Point
In muschellij2/atropos: Core Software Infrastructure for 'ANTsR'

Description Usage Arguments Value Examples

Get index from spatial point of an 'antsImage'.

1	antsTransformPhysicalPointToIndex(x, point)

`x`	Image object of S4 class 'antsImage' to get values from.
`point`	image physical point

array of pixel values

img<-makeImage(c(10,10),rnorm(100))
pt<-antsTransformPhysicalPointToIndex(img,c(2,2))
arr = as.array(img)
testthat::expect_error(
antsTransformPhysicalPointToIndex(arr,c(2,2)), "antsImage")
testthat::expect_error(
antsTransformPhysicalPointToIndex(img,c("2",2)), "point must be") 
testthat::expect_error(
antsTransformPhysicalPointToIndex(img,c(2,2,2)), "matrix must be of")