as.matrix: antsImage to numeric matrix
In stnava/itkImageR: Examples using Rcpp to interface R and ITK

Description Usage Arguments Value Author(s) Examples

Convert/coerce an antsImage object to a numeric matrix. More precisely, extract a numeric vector from an antsImage.

1	as.matrix( x [, mask] [, region] )

`x`	Image object of S4 class 'antsImage' to be coerced.
`mask`	`logical vector/matrix/array` to be used as mask while extracting pixel values from the image. `1/TRUE`s return corresponding pixel values ; `0/FALSE`s return `NA`. The vector provided will be 'matched' against the image-region column-wise meaning that first column of image-region is extracted using first column-length values from the vector, second column is extracted using the next column-length values from the vector and so on. Default: entire region is extracted.
`region`	`antsRegion` with in the `antsImage` to be considered for extraction. An `antsRegion` object can be created using `new`. Default: largest-possible-region( entire image ) in the image.

numeric vector of dimensions equal to that of 'region' considered – Success ; NA – Failure

Shrinidhi KL

## Not run: 
# extract a vector from an image 'img' of class 'antsImage' by considering only the region starting at index (1,1,1) with size (10,10,10)
reg = new( "antsRegion" , index = c(1,1,1) , size = c(10,10,10) )
vect = as.matrix( img , region = reg )

## End(Not run)