Feature request: could scales::breaks_log have an argument to return breaks that encompass the full range of the data?

[davidhodge931]

Is it possible for scales::log_breaks to get an argument to where the breaks should cover the full range of the data?

library(tidyverse)
range(pressure$pressure)
#> [1]   0.0002 806.0000
scales::breaks_log(7)(range(pressure$pressure))
#> [1] 1e-04 1e-03 1e-02 1e-01 1e+00 1e+01 1e+02 1e+03
scales::breaks_log(3)(range(pressure$pressure))
#> [1] 1e-04 1e-01 1e+02
scales::breaks_log(1)(range(pressure$pressure))  
#> [1] 1e-04

scales::breaks_pretty(7)(range(pressure$pressure))
#>  [1]   0 100 200 300 400 500 600 700 800 900
scales::breaks_pretty(3)(range(pressure$pressure))
#> [1]    0  200  400  600  800 1000
scales::breaks_pretty(1)(range(pressure$pressure))
#> [1]    0 1000

^{Created on 2023-07-21 with reprex v2.0.2}

[teunbrand]

I'm sorry David: I'm afraid I don't fully understand. Can you give an example of how something is not quite behaving as you'd like and what the result should be instead?

[davidhodge931]

In the example above, the max of the data is 806. If you use scales::breaks_log(3)(range(pressure$pressure)), you get a max of 100. It might be useful if you could specify a bounds argument to ensure that the log breaks always cover the range of the data? If you think it's too hard, feel free to close @teunbrand?

[davidhodge931]

I'll close this. Seems too difficult and not that necessary on reflection

[davidhodge931]

On reflection, this would be super useful if possible.

Example code below demonstrating how breaks_extended has an argument to ensure the breaks encompass the range of the data.

scales::breaks_log does not have this, and this Issue is a request of whether it could have an argument to do this? I.e. return c( 0.0001, 0.1, 100, 1000) in the below breaks_log code.

range(pressure$pressure)
#> [1]   0.0002 806.0000

scales::number(scales::breaks_extended(3)(range(pressure$pressure)), accuracy = 0.0001)
#> [1] "0.0000"   "400.0000" "800.0000"

scales::number(scales::breaks_extended(3, only.loose = TRUE)(range(pressure$pressure)), accuracy = 0.0001)
#> [1] "0.0000"     "500.0000"   "1 000.0000"

scales::number(scales::breaks_log(3)(range(pressure$pressure)), accuracy = 0.0001)
#> [1] "0.0001"   "0.1000"   "100.0000"

^{Created on 2024-07-21 with reprex v2.1.0}

This links to #440 and would be useful for all scales::breaks_* functions.

When this option is triggerred and it falls back to breaks_extended, it should use breaks_extended(..., only.loose = TRUE)