parc_mean_mat {ciftiTools} | R Documentation |
Make parcellation mean matrix
Description
Create a matrix that compute the average value for each parcel.
Usage
parc_mean_mat(parc)
Arguments
parc |
A single-column "dlabel" |
Details
From a single-column "dlabel" "xifti"
object, make a K \times V
matrix where row k
is a vector corresponding to the kth Key value,
with 1/k_i
at locations with that key value, and 0
elsewhere.
k_i
is the total number of locations inside Key k
.
So, the sum of each row will be 1
, and each column will only
have exactly one non-zero value (because each location only has one Key
value) except medial wall locations will have all zeroes.
Multiplying the result of parc_mean_mat
with a V \times T
matrix
of timeseries data, e.g. from as.matrix(dlabel_xii)
, will yield the
average value for each Key.
Value
The parcellation matrix
[Package ciftiTools version 0.16.1 Index]