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Retrieve the last tracedump created by ggtrace()

Source: R/tracedump.R
last_ggtrace.Rd

last_ggtrace() retrieves the last trace dump created by ggtrace() - i.e., from the last time the trace has been triggered.

Usage

last_ggtrace()

set_last_ggtrace(value)

clear_last_ggtrace()

Value

List

Details

A tracedump refers to the output of an expression evaluated inside a traced function when a trace is triggered. In the context of ggtrace(), the tracedump is a list that is as long as the number of step-expression pairs, where each element is the output of each expression (trace_exprs) evaluated at each step (trace_steps) inside the execution environment of the function or ggproto method.

clear_last_ggtrace() sets the value of last_ggtrace() to NULL and returns NULL.

See also

global_ggtrace()

Examples

library(ggplot2)

ggtrace(StatSmooth$compute_group, trace_steps = -1, trace_exprs = quote(head(prediction)))
#> `StatSmooth$compute_group` now being traced.

ggplot(mtcars, aes(mpg, hp)) + geom_point() + geom_smooth(method = 'lm')
#> `geom_smooth()` using formula = 'y ~ x'
#> Triggering trace on `StatSmooth$compute_group`
#> Untracing `StatSmooth$compute_group` on exit.


last_ggtrace()
#> [[1]]
#>          x        y     ymin     ymax       se flipped_aes
#> 1 10.40000 232.2531 201.8649 262.6414 14.87963       FALSE
#> 2 10.69747 229.6265 199.9139 259.3392 14.54880       FALSE
#> 3 10.99494 227.0000 197.9569 256.0430 14.22094       FALSE
#> 4 11.29241 224.3734 195.9934 252.7534 13.89627       FALSE
#> 5 11.58987 221.7468 194.0230 249.4707 13.57502       FALSE
#> 6 11.88734 219.1203 192.0450 246.1956 13.25743       FALSE
#> 

ggtrace(
  StatSmooth$compute_group,
  trace_steps = -1,
  trace_exprs = quote(prediction),
  verbose = FALSE
)
#> `StatSmooth$compute_group` now being traced.

ggplot(mtcars, aes(mpg, hp)) + geom_point() + geom_smooth(method = 'lm')
#> `geom_smooth()` using formula = 'y ~ x'
#> Triggering trace on `StatSmooth$compute_group`
#> Untracing `StatSmooth$compute_group` on exit.


head(last_ggtrace()[[1]])
#>          x        y     ymin     ymax       se flipped_aes
#> 1 10.40000 232.2531 201.8649 262.6414 14.87963       FALSE
#> 2 10.69747 229.6265 199.9139 259.3392 14.54880       FALSE
#> 3 10.99494 227.0000 197.9569 256.0430 14.22094       FALSE
#> 4 11.29241 224.3734 195.9934 252.7534 13.89627       FALSE
#> 5 11.58987 221.7468 194.0230 249.4707 13.57502       FALSE
#> 6 11.88734 219.1203 192.0450 246.1956 13.25743       FALSE