| subset_dim | R Documentation | 
Utility function. Subset an object x with a 
dim attribute (matrix/array/data.frame/etc.)
and return another with dimensions pmin(dim, dim(x))
subset_dim(x, dim, random)
| x | object to subset | 
| dim | new dimensions | 
| random | logical, whether to take a random subset or just the head. | 
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