Suggests a alpha opacity to plot with as a function of the number of observation.
Arguments
- index
A vector, typically a numeric row index of the data to coerce to a logical index.
- n
Single numeric, the number of rows of the data use as a replicate return length.
See also
Other cheem utility:
color_scale_of(),
contains_nonnumeric(),
is_discrete(),
is_diverging(),
linear_tform(),
logistic_tform(),
problem_type(),
rnorm_from(),
sug_basis(),
sug_manip_var()
Examples
library(cheem)
## Coerce a numeric index to logical
as_logical_index(c(1, 4:10, 15), nrow(mtcars))
#> [1] TRUE FALSE FALSE TRUE TRUE TRUE TRUE TRUE TRUE TRUE FALSE FALSE
#> [13] FALSE FALSE TRUE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
#> [25] FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
## Logical indexs are unchanged
as_logical_index(mtcars$mpg > 30, nrow(mtcars))
#> [1] FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
#> [13] FALSE FALSE FALSE FALSE FALSE TRUE TRUE TRUE FALSE FALSE FALSE FALSE
#> [25] FALSE FALSE FALSE TRUE FALSE FALSE FALSE FALSE