We have already seen that in Rain it is easy to display time series data. Personally I prefer to be in charge of the axes, so we will use the 'xyplot' option for the chart. Then we have the option that the x-values corresponding to the tick-marks can be converted into dates.

      day„1
      prod„1
      l„½time
      t„day+7×0,¼¯1+l÷7
      ch.Set 'style' 'boxed,xyplot'
      ch.Set 'xstyle' 'date'
      ch.Plot time[t],[1.5]demand[t;prod]
      View PG„ch.Close

This can easily be expanded into a program dts day prod which allows all possible time series for the different days and the different products to be produced:

      dts prod_day;day;prod;ts;d;p;w
      prod day„prod_day
      © produce a time series for the different days
      © of the week and for the different products
      ts„time,demand ª w„½time
      ch.Set'style' 'boxed,xyplot'
      d„'Sunday' 'Monday' 'Tuesday' 'Wednesday' 'Thursday' 'Friday' 'Saturday' '
      p„'Sliced Bread' 'Unsliced Bread' 'Organic Bread'
      ch.Set'head' 'Time Series for',(p[prod]),' on Day',d[day]
      ch.Set'xstyle' 'date'
      ch.Plot ts[day+7×0,¼¯1+˜w÷7;1,1+prod]

To see the result, simply type View PG„ch.Close from the session manager. (We have omitted the command deliberately.)

Alternatively, if you want to view all three of the different products for a given day, then it is sensible to provide a key:

      allprod day;prod;ts;d;p;w
      © produce time series for the different products
       ts„time,demand ª w„½time
       ch.Set'style' 'boxed,xyplot'
       d„'Sunday' 'Monday' 'Tuesday' 'Wednesday' 'Thursday' 'Friday' 'Saturday' '
       p„'Sliced Bread' 'Unsliced Bread' 'Organic Bread'
       ch.Set'head' 'Time Series for all products on ',d[day]
       ch.Set'xstyle' 'date'
       ch.Set'key' 'Sliced,Unsliced,Organic'
       ch.Plot ts[day+7×0,¼¯1+˜w÷7;]
       View PG„ch.Close
       allprod 3

If you want to see all possible 21 combinations of products and days, then the program MbyN comes in handy – it divides the plotting region into M×N regions (specified by the left argument) and executes each line of the character matrix right argument:

3 7 MbyN (21 4½'dts '),•21 1½¼3 7

This works by using the command ch.New as explained in the next section.