press | R Documentation |

`press()`

is used to run `mark()`

across a grid of parameters and
then *press* the results together.

The parameters you want to set are given as named arguments and a grid of all possible combinations is automatically created.

The code to setup and benchmark is given by one unnamed expression (often
delimited by `\{`

).

If replicates are desired a dummy variable can be used, e.g. `rep = 1:5`

for
replicates.

```
press(..., .grid = NULL)
```

`...` |
If named, parameters to define, if unnamed the expression to run. Only one unnamed expression is permitted. |

`.grid` |
A pre-built grid of values to use, typically a data.frame or tibble. This is useful if you only want to benchmark a subset of all possible combinations. |

```
# Helper function to create a simple data.frame of the specified dimensions
create_df <- function(rows, cols) {
as.data.frame(setNames(
replicate(cols, runif(rows, 1, 1000), simplify = FALSE),
rep_len(c("x", letters), cols)))
}
# Run 4 data sizes across 3 samples with 2 replicates (24 total benchmarks)
press(
rows = c(1000, 10000),
cols = c(10, 100),
rep = 1:2,
{
dat <- create_df(rows, cols)
bench::mark(
min_time = .05,
bracket = dat[dat$x > 500, ],
which = dat[which(dat$x > 500), ],
subset = subset(dat, x > 500)
)
}
)
```

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