I imported one of my rasters into ArcMap to see how it is displayed in this program and noticed that it's values do not correspond to the same values I had in R.
Here are some screen caps:
In R:
Info about the raster (.asc format) in R:
Formal class 'RasterLayer' [package "raster"] with 12 slots
..@ file :Formal class '.RasterFile' [package "raster"] with 13 slots
.. .. ..@ name : chr "D:\\Users\\cost_guinea_29N.asc"
.. .. ..@ datanotation: chr "FLT4S"
.. .. ..@ byteorder : chr "little"
.. .. ..@ nodatavalue : num -Inf
.. .. ..@ NAchanged : logi FALSE
.. .. ..@ nbands : int 1
.. .. ..@ bandorder : chr "BIL"
.. .. ..@ offset : int 0
.. .. ..@ toptobottom : logi TRUE
.. .. ..@ blockrows : int 1
.. .. ..@ blockcols : int 909
.. .. ..@ driver : chr "gdal"
.. .. ..@ open : logi FALSE
..@ data :Formal class '.SingleLayerData' [package "raster"] with 13 slots
.. .. ..@ values : logi(0)
.. .. ..@ offset : num 0
.. .. ..@ gain : num 1
.. .. ..@ inmemory : logi FALSE
.. .. ..@ fromdisk : logi TRUE
.. .. ..@ isfactor : logi FALSE
.. .. ..@ attributes: list()
.. .. ..@ haveminmax: logi FALSE
.. .. ..@ min : num Inf
.. .. ..@ max : num -Inf
.. .. ..@ band : int 1
.. .. ..@ unit : chr ""
.. .. ..@ names : chr "cost_guinea_29N"
..@ legend :Formal class '.RasterLegend' [package "raster"] with 5 slots
.. .. ..@ type : chr(0)
.. .. ..@ values : logi(0)
.. .. ..@ color : logi(0)
.. .. ..@ names : logi(0)
.. .. ..@ colortable: logi(0)
..@ title : chr(0)
..@ extent :Formal class 'Extent' [package "raster"] with 4 slots
.. .. ..@ xmin: num -176511
.. .. ..@ xmax: num 654315
.. .. ..@ ymin: num 790241
.. .. ..@ ymax: num 1408105
..@ rotated : logi FALSE
..@ rotation:Formal class '.Rotation' [package "raster"] with 2 slots
.. .. ..@ geotrans: num(0)
.. .. ..@ transfun:function ()
..@ ncols : int 909
..@ nrows : int 676
..@ crs :Formal class 'CRS' [package "sp"] with 1 slot
.. .. ..@ projargs: chr NA
..@ history : list()
..@ z : list()
Same layer, same source, same format, but different values.. why? R seems to display the correct values whereas ArcMap doesn't.