Change how NA values are printed
NA values in the huxtable are printed as the value of na_string.
na_string(ht) na_string(ht) <- value set_na_string(ht, row, col, value ) map_na_string(ht, row, col, fn)
| ht | A huxtable. | 
| row | A row specifier. See rowspecs for details. | 
| col | An optional column specifier. | 
| fn | A mapping function. See mapping-functions for details. | 
| value | A character vector or matrix. Set to  | 
na_string() returns the na_string property.
set_na_string() returns the modified huxtable.
Other formatting functions: 
background_color(),
bold(),
font_size(),
font(),
number_format(),
text_color()
jams[3, 2] <- NA jams set_na_string(jams, "---")
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