Remove rows whose rounded (x, y) coordinates have already been used

Filters `df` to drop any rows whose rounded coordinate key (as produced by `.xy_key(x, y)`) appears in `used_df`.

Usage

remove_used_points(df, used_df)

Arguments

df

A data frame containing at least columns `x` and `y`.

used_df

A data frame containing at least columns `x` and `y` defining the set of already-used points to exclude.

Value

A filtered data frame with the same columns as `df`, excluding rows whose rounded `(x, y)` matches any row in `used_df`.

Details

Matching is performed on rounded coordinates, not exact floating-point values. Internally, keys are computed as `paste0(round(x), "_", round(y))`.

This function uses `dplyr::filter()` (and the `|>` pipe), so `dplyr` must be installed and a pipe operator must be available.

Examples

df <- data.frame(x = c(0.1, 1.2, 1.6, 2.0),
                 y = c(0.2, 3.4, 3.4, 9.5),
                 id = 1:4)
used_df <- data.frame(x = c(1.49, 2.1),
                      y = c(3.49, 9.49))

# Removes rows rounding to (1,3) and (2,9)
remove_used_points(df, used_df)
#>     x   y id
#> 1 0.1 0.2  1
#> 2 1.6 3.4  3
#> 3 2.0 9.5  4