Get Index from Spatial Point

Get index from spatial point of an 'antsImage'.

antsTransformPhysicalPointToIndex(x, point)

Arguments

x

Image object of S4 class 'antsImage' to get values from.

point

image physical point

Value

array of pixel values

Examples

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"
)