neighbors_in_regions: Create the neighbor indices on a group of subregions.

In kangjian2016/SpatCorrImage: Spatial Adaptive Varying Corraltion Analysis for for Multimodal Neuroimaging Data

Description

Create the neighbor indices on a group of subregions.

Usage

neighbors_in_regions(region_idx, nb_idx, nb_dist)

Arguments

region_idx	a list of voxels indices for multiple regions. The length is the number of regions.
nb_idx	matrix with the neighbor indices of each voxel in each row
nb_dist	matrix with the distances between neighbors and the voxel in each row

Value

a list object contains of multiple list objects for neighbor indices and distances for different regions. For each region, the list object contions two matrices: idx and dist. idx contains the neighbor indices of each voxel in each row. dist contains the distances between neighbors and the voxel in each row.

Author(s)

Jian Kang <[e-mail]>

Examples

dim_img = c(10,10,10)
grids <- lapply(1:3,function(i) seq(-round(dim_img[i]/2)+1,round(dim_img[i]/2),length=dim_img[i]))
nb <- find_image_neighbors(grids)
region_mask_3 <- create_sphere_mask(grids,radius=3)
region_mask_2 <- create_sphere_mask(grids,radius=2)
region_idx <- list(which(region_mask_3&(!region_mask_2)),which(region_mask_2))
nb_regions <- neighbors_in_regions(region_idx,nb$idx,nb$dist)

kangjian2016/SpatCorrImage documentation built on Oct. 22, 2021, 1:21 a.m.