imager (version 0.42.19)

map_il: Type-stable map for use with the purrr package

Description

Works like purrr::map, purrr::map_dbl and the like but ensures that the output is an image list.

Usage

map_il(...)
map2_il(...)
pmap_il(...)

Value

an image list

Arguments

...

passed to map

Functions

• map2_il(): Parallel map (two values)

• pmap_il(): Parallel map (multiple values)

Author

Simon Barthelme

Examples

#Returns a list
imsplit(boats,"x",2) %>% purrr::map(~ isoblur(.,3))
#Returns an "imlist" object
imsplit(boats,"x",2) %>% map_il(~ isoblur(.,3))
#Fails if function returns an object that's not an image
try(imsplit(boats,"x",2) %>% map_il(~ . > 2))
#Parallel maps
map2_il(1:3,101:103,~ imshift(boats,.x,.y))
pmap_il(list(x=1:3,y=4:6,z=7:9),function(x,y,z) imfill(x,y,z))