Nothing
## ---- echo = FALSE, message = FALSE--------------------------------------
knitr::opts_chunk$set(collapse = T, comment = "#>")
library(neuroim)
## ------------------------------------------------------------------------
fileName <- system.file("extdata", "global_mask.nii", package="neuroim")
vol <- loadVolume(fileName)
## ------------------------------------------------------------------------
print(vol)
## ------------------------------------------------------------------------
class(vol)
is.array(vol)
dim(vol)
vol[1,1,1]
vol[64,64,24]
## ------------------------------------------------------------------------
vol2 <- vol + vol
sum(vol2) == 2 * sum(vol)
vol3 <- vol2 - 2*vol
all(vol3 == 0)
## ------------------------------------------------------------------------
vol2 <- as.logical(vol)
print(vol2[1,1,1])
## ------------------------------------------------------------------------
# create an 64X64X64 array of zeros
x <- array(0, c(64,64,64))
# create a 'BrainSpace' instance that describes the geometry of the image including, at minimu its dimensions and voxel spacing
bspace <- BrainSpace(Dim=c(64,64,64), spacing=c(1,1,1))
vol <- BrainVolume(x, bspace)
vol
## ------------------------------------------------------------------------
vol2 <- BrainVolume((vol+1)*25, space(vol))
max(vol2)
space(vol2)
## ------------------------------------------------------------------------
writeVolume(vol2, "output.nii")
## adding a '.gz' extension results ina gzipped file.
writeVolume(vol2, "output.nii.gz")
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