1 files changed, 13 insertions, 0 deletions
diff --git a/R/mkin_wide_to_long.R b/R/mkin_wide_to_long.R
new file mode 100644
index 0000000..6db2f33
--- /dev/null
+++ b/R/mkin_wide_to_long.R
@@ -0,0 +1,13 @@
+mkin_wide_to_long <- function(wide_data, time = "t")
+{
+  colnames <- names(wide_data)
+  vars <- subset(colnames, colnames != time)
+  n <- length(colnames) - 1
+  if (!(time %in% colnames)) stop("The data in wide format have to contain a variable named ", time, ".")
+  long_data <- data.frame(
+    name = rep(vars, each = length(wide_data[[time]])),
+    time = rep(wide_data[[time]], n),
+    value = unlist(wide_data[vars]),
+    row.names = NULL)
+  return(long_data)
+}