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Get the single hottest line

Source: R/hot-lines.R
pv_worst_line.Rd

Returns the hottest source line with full context. Useful for quickly identifying the #1 optimization target.

Usage

pv_worst_line(x, context = 5)

Arguments

x

A profvis object.

context

Number of source lines to include before and after.

Value

A list with:

  • location: File path and line number (e.g., "R/foo.R:42")

  • label: Function name

  • filename: Source file path

  • linenum: Line number

  • time_ms: Time in milliseconds

  • pct: Percentage of total time

  • code: The source line

  • context: Vector of surrounding source lines

  • callers: Data frame of functions that call this location

Returns NULL if no source references are available.

Examples

p <- pv_example()
pv_worst_line(p)
#> $location
#> [1] "example_code.R:13"
#> 
#> $label
#> [1] "rnorm"
#> 
#> $filename
#> [1] "example_code.R"
#> 
#> $linenum
#> [1] 13
#> 
#> $time_ms
#> [1] 50
#> 
#> $pct
#> [1] 71.4
#> 
#> $code
#> [1] "x[i] <- rnorm(1)"
#> 
#> $context
#>  [1] "}"                               ""                               
#>  [3] "generate_data <- function(n) {"  "  x <- numeric(n)"              
#>  [5] "  for (i in seq_len(n)) {"       "    x[i] <- rnorm(1)"           
#>  [7] "  }"                             "  x"                            
#>  [9] "}"                               ""                               
#> [11] "transform_data <- function(x) {"
#> 
#> $callers
#>           label samples pct
#> 1 generate_data       6 100
#>