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A loggr example
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library(loggr) # should be executed before sourcing the script | |
log_file("all.log") | |
log_file("messages.log", DEBUG, INFO, .warning = FALSE, .error = FALSE) | |
log_file("console", WARN, ERROR, CRITICAL, .message = FALSE) | |
top_n <- function(data_set, sort_var, n = 3, desc = FALSE) | |
{ | |
if (!is.data.frame(data_set)) | |
log_critical("Invalid data_set provided.") | |
if (!is.character(sort_var) || !sort_var %in% names(data_set)) | |
log_critical("Invalid column for sorting.") | |
if (NROW(data_set) < n) { | |
log_warn("Not enough rows in data set. Returning all rows.") | |
return(data_set) | |
} | |
msg <- sprintf("Received %d rows. Selecting top %d according to %s (%s).", | |
NROW(data_set), | |
n, | |
sort_var, | |
if (desc) "descending" else "ascending") | |
log_info(msg) | |
idx <- order(data_set[[sort_var]], decreasing = desc) | |
head(data_set[idx, ], n) | |
} | |
top_n(iris, "Sepal.Width", 3) | |
top_n(iris, "Sepal.Width", 3, desc = TRUE) | |
top_n(iris[1:3, ], "Sepal.Width", 5) | |
top_n(1:10, "nosuch", 5) |
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