DAT must be a 2-column data frame with the 1-st column as the date string, and the 2nd column is the numeric return series.
color4
Color choice for annual calendar heatmap, the default is "r2b".
color5
Color choice for 6-year calendar heatmap, the default is "jet".
Details
This GUI is designed for financial time series, maily daily stock price. Other time series data works also, as long as it has a date column. We call function calendarPlot() from package "openair", and modified the function calendarHeat() to fit daily price.