Changelog
moveEZ (development version)
moveplot(), moveplot2() and moveplot3() now validate time.var and group.var before plotting. Both must name factor columns of the data supplied to biplot(); a numeric (e.g. integer year), character or misspelt column now stops with an informative error explaining how to fix it, instead of failing downstream. Levels of time.var without observations are dropped, which previously caused moveplot2() and moveplot3() to stop.
The handling of missing values is now documented: biplot() removes rows containing NA with a warning. moveplot3() reports when this is the reason for unequal numbers of observations per time level, and stops if target contains missing values.
moveplot2() and moveplot3() now apply the same convex hull guard as moveplot(): groups with fewer than three non-collinear observations at a time level are displayed as points instead of a hull, rather than being passed to chull() unconditionally. The guard is documented in the hulls argument of all three functions.
moveplot2() now reflects every level supplied in align.time. Previously only one level was reflected when align.time was a vector. align.time values that are not levels of time.var, and a reflect that does not match align.time, now stop with an informative error. The documentation of reflect has been clarified: as in biplotEZ::reflect(), "x" reverses the direction of the x-axis (horizontal flip) and "y" that of the y-axis (vertical flip).