Create a distance matrix from cell seg data.
distance_matrix(csd)A data frame with Cell X Position
and Cell Y Position columns, such as the result of
read_cell_seg_data.
A square matrix with both dimensions equal to nrow(d).
The value at [i, j] will be the distance from the cell
at row i of csd to the cell at row j.
The returned matrix is symmetric.
Other distance functions:
compute_all_nearest_distance(),
count_touching_cells(),
count_within_batch(),
count_within_many(),
count_within(),
find_nearest_distance(),
spatial_distribution_report(),
subset_distance_matrix()