biom_file = system.file("extdata", "rich_sparse_otu_table.biom", package = "biom")
x = read_biom(biom_file)
header(x)
biom_shape(x)
nrow(x)
ncol(x)
rownames(x)
colnames(x)
matrix_element_type(x)
biom_data(x)
observation_metadata(x)
sample_metadata(x)
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