When finding wrong or unexpected values in an exported table, it can be useful to temporarily correct them by hard-coding a value. However, this manual correction should be undone as soon as the central database is updated with the correction.

`manual_correction()`

applies a correction in a specific table column location and throws an error if the correction is already in place. This check applies only once per R session so you can source your script without errors.`reset_manual_correction()`

resets all checks. For instance, it is called by`read_trialmaster()`

.

## Usage

```
manual_correction(
data,
col,
rows,
wrong,
correct,
verbose = getOption("edc_correction_verbose", TRUE)
)
reset_manual_correction()
```

## Arguments

- data, col, rows
the rows of a column of a dataframe where the error lies

- wrong
the actual wrong value

- correct
the temporary correction value

- verbose
whether to print informations (once)

## Examples

```
library(dplyr)
#>
#> Attaching package: ‘dplyr’
#> The following objects are masked from ‘package:stats’:
#>
#> filter, lag
#> The following objects are masked from ‘package:base’:
#>
#> intersect, setdiff, setequal, union
x = iris %>% mutate(id=row_number(), .before=1) %>% as_tibble()
x$Sepal.Length[c(1,3,5)]
#> [1] 5.1 4.7 5.0
#1st correction is silent
manual_correction(x, Sepal.Length, rows=c(1,3,5),
wrong=c(5.1, 4.7, 5.0), correct=c(5, 4, 3))
#> Manual correction of "x$Sepal.Length":
#> ℹ Old: 5.1, 4.7, and 5
#> ℹ New: 5, 4, and 3
x$Sepal.Length[c(1,3,5)]
#> [1] 5 4 3
#further correction is silent
manual_correction(x, Sepal.Length, rows=c(1,3,5),
wrong=c(5.1, 4.7, 5.0), correct=c(5, 4, 3))
#if the database is corrected, an error is thrown
if (FALSE) {
reset_manual_correction()
x$Sepal.Length[c(1,3,5)] = c(5, 4, 3) #mimics db correction
manual_correction(x, Sepal.Length, rows=c(1,3,5),
wrong=c(5.1, 4.7, 5.0), correct=c(5, 4, 3))
}
```