Determine type of variable passed by user

Function to check a variable whether is composed of an antsImage, list of antsImages, or simply filenames. If none of the above, an error is returned.

checkAntsInput(input, checkHeaders = FALSE)

Arguments

input	the variable to be checked
checkHeaders	make sure all images have the same headers

Value

Type of variable (antsImage, antsImageList, antsFiles) or error if variable cannot be established.

Examples

if (FALSE) {
        files = Sys.glob('/data/jag/nifti/*.nii.gz')
         myimagelist = imageFileNames2ImageList(files)
         checkAntsInput(myimagelist) # returns 'antsImageList'
         checkAntsInput(antsFiles) # returns 'antsFiles'
         checkAntsInput(myimagelist[[1]]) # returns 'antsImage'
         }