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You might want to avoid sparklines on non-UTF-8 systems, because they do not look good. You can use is_utf8_output() to test for support for them.
is_utf8_output()
spark_line(x)
A numeric vector between 0 and 1
x <- seq(0, 1, length = 10) spark_line(x)
#> ⣀⡠⠔⠊⠉
spark_bar()