fslmaths -mul
.
The R functions wraps fslmaths
fslmul(file, file2, outfile = NULL, retimg = TRUE, reorient = FALSE,
intern = FALSE, opts = "", ...)
readNIfTI
.system
fslmaths
readNIfTI
.retimg
then object of class nifti. Otherwise,
Result from system command, depends if intern is TRUE or FALSE.