Compute the canonical metadata-only frame schema

The schema describes aligned assay annotations, scalar column types and factor levels, multivariate block trailing axes and components, spatial identity, entities, relations, auxiliary tables, and active-assay policy. It inspects descriptors and metadata only and never reads numerical values.

Usage

frame_schema(x)

Arguments

x

An fmri_frame, synchronized view, or canonical frame schema.

Value

A serializable fmri_frame_schema.

Examples

sp <- volume_space(dim = c(2, 2, 2), affine = diag(4))
frame <- fmri_frame(
  assays = list(bold = matrix(rnorm(4 * n_features(sp)), nrow = 4)),
  observations = data.frame(.obs_id = sprintf("vol-%d", 1:4)),
  space = sp
)
schema <- frame_schema(frame)
schema$active_assay
#> $policy
#> [1] "named"
#> 
#> $name
#> [1] "bold"
#>