The GANTT Procedure

Example 6.24: Multisegment Gantt Charts

The following is a simple example that illustrates the generation of multisegmented Gantt charts. The SCHED data set identifies the city, the arrival time, and the departure time for each of four traveling salespeople. In addition, a _PATTERN variable is used to identify the pattern to be used for drawing the bar. The objective is to display the complete schedule for each sales person on a single row. This would require displaying several bars on a single row, each bar corresponding to the time spent in a city. In order to do this, you need first to sort the SCHED data set by Salesperson and Arrival Time and then to add a SEGMT_NO variable that identifies the number of the segment that, in this case, is the order in which the salesperson visits the city. The resulting data set, NEWSCHED, is shown in Output 6.24.1. You next create the LABELS data set in order to identify the names of the cities above the bars; the resulting Gantt chart is shown in Output 6.24.2.

Notice that each bar is drawn using the pattern identified by the _PATTERN variable in the SCHED data set. In the absence of the _PATTERN variable, the pattern associated with the resource-constrained schedule would have been used for all the bars. This is the same mechanism that produced the split segments in Example 6.13 although the SEGMT_NO variable in this case was automatically created by the CPM procedure.

  
    title1 'Gantt Example 24'; 
    title2 'Schedule of Cities Visited by Salesperson'; 
  
    data sched; 
       format city $12. from to date7. ; 
       input person $ city & from & date7. to & date7. _pattern; 
       datalines; 
    Clark   New York     01May04  03May04  10 
    Clark   Boston       06May04  09May04  11 
    Clark   Wisconsin    12May04  15May04  12 
    Clark   Chicago      18May04  24May04  13 
    Clark   New York     28May04  02Jun04  10 
    Stevens Charlotte    02May04  04May04  14 
    Stevens Atlanta      08May04  10May04  15 
    Stevens Dallas       12May04  15May04  16 
    Stevens Denver       17May04  20May04  17 
    Stevens Nashville    27May04  02Jun04  18 
    Stevens Charlotte    04Jun04  06Jun04  14 
    Jackson Los Angeles  01May04  08May04  19 
    Jackson Las Vegas    11May04  18May04  20 
    Jackson Portland     21May04  23May04  21 
    Jackson Seattle      25May04  29May04  22 
    Rogers  Miami        02May04  07May04  23 
    Rogers  Tampa        11May04  15May04  24 
    Rogers  New Orleans  18May04  24May04  25 
    Rogers  Houston      28May04  01Jun04  26 
    ; 
  
    /* Sort data by person, from */ 
    proc sort data=sched; 
       by person from; 
       run;
 

  
    /* Add Segmt_no variable */ 
    data newsched; 
       set sched; 
       retain segmt_no; 
       if person ne lag(person) then segmt_no=1; 
       else segmt_no = segmt_no + 1; 
       output; 
       run; 
  
    proc print data=sched; 
       run; 
  
    data labels; 
       _y=-1; 
       _lvar="city"; 
       _xvar="from"; 
       _flabel=""; 
       _hlabel=0.75; 
       _yoffset = -.2; 
    run; 
  
    pattern1 v=s r=25; 
  
    proc gantt data=newsched labdata=labels; 
       id person; 
       chart / ss=from sf=to compress labsplit='.' scale=2 
               nolegend nojobnum skip=3 
               ref='01may04'd to '30jun04'd by week; 
       run;
 

Output 6.24.1: NEWSCHED Data Set

Data NEWSCHED Obs person city from to _pattern segmt_no 1 Clark New York 01MAY04 03MAY04 10 1 2 Clark Boston 06MAY04 09MAY04 11 2 3 Clark Wisconsin 12MAY04 15MAY04 12 3 4 Clark Chicago 18MAY04 24MAY04 13 4 5 Clark New York 28MAY04 02JUN04 10 5 6 Jackson Los Angeles 01MAY04 08MAY04 19 1 7 Jackson Las Vegas 11MAY04 18MAY04 20 2 8 Jackson Portland 21MAY04 23MAY04 21 3 9 Jackson Seattle 25MAY04 29MAY04 22 4 10 Rogers Miami 02MAY04 07MAY04 23 1 11 Rogers Tampa 11MAY04 15MAY04 24 2 12 Rogers New Orleans 18MAY04 24MAY04 25 3 13 Rogers Houston 28MAY04 01JUN04 26 4 14 Stevens Charlotte 02MAY04 04MAY04 14 1 15 Stevens Atlanta 08MAY04 10MAY04 15 2 16 Stevens Dallas 12MAY04 15MAY04 16 3 17 Stevens Denver 17MAY04 20MAY04 17 4 18 Stevens Nashville 27MAY04 02JUN04 18 5 19 Stevens Charlotte 04JUN04 06JUN04 14 6

Output 6.24.2: Multisegment Gantt Chart