group.data.to.array: Convert group 2D data (1 vector per subject) to 4D array...

In fsbrain: Managing and Visualizing Brain Surface Data

Convert group 2D data (1 vector per subject) to 4D array format.

Description

In general, 1D morphometry data for a group can be stored in a dataframe, a named list, or already a 4D array. This function will convert the given format to 4D array format.

Usage

group.data.to.array(data)

Arguments

data	2D matrix, named list, or data.frame of group data. The data is expected to be a vector (1D) per subject, as suitable for surface based (vertex-wise) measures. Subjects in rows, per-vertex data in columns.

Value

the 4D array form of the group data. No values are changed, this is only a different data layout. In neuroimaging, the first 3 dimensions are space, and the 4th is the time/subject dimension.

Examples

    # create per-vertex data for 255 subjects.
    mat = matrix(rnorm(255 * 163842, 3.0, 0.5), nrow=255, ncol = 163842);
    fsbrain:::group.data.to.array(mat);

fsbrain documentation built on July 9, 2023, 7:12 p.m.