docs(man): add an example about the use of the 'AxisTS' argument of the plot.OutputsModel function

Refs #122

man/plot.OutputsModel.Rd

@@ -136,6 +136,15 @@ plot(simGR4J$OutputsModel, Qobs = simGR4J$Qobs,
      LayoutHeights = c(0.5, 1, 1))
 
 
+### customize x-axis on time series plot
+FunAxisTS <- function(x) {
+  axis.POSIXct(side = 1, x = x$DatesR,
+  at = pretty(x$DatesR, n = 10),
+  format = "\%Y-\%m-\%d")
+}
+plot(simGR4J$OutputsModel, Qobs = simGR4J$Qobs, AxisTS = FunAxisTS)
+
+
 ### add a main title
 
 ## the whole list of settable par's