Example 8.24 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 8.24.1. 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 8.24.2.
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 8.13 although the SEGMT_NO variable in this case was automatically created by the CPM procedure.
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=newsched;
title2 'Data NEWSCHED';
run;
data labels;
_y=-1;
_lvar="city";
_xvar="from";
_flabel="";
_hlabel=0.75;
_yoffset = -.2;
run;
* set up required pattern statements;
pattern1 v=s r=25;
title1 'Gantt Example 24';
title2 'Schedule of Cities Visited by Salesperson';
proc gantt graphics 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 8.24.1
NEWSCHED Data Set
New York |
01MAY04 |
03MAY04 |
Clark |
10 |
1 |
Boston |
06MAY04 |
09MAY04 |
Clark |
11 |
2 |
Wisconsin |
12MAY04 |
15MAY04 |
Clark |
12 |
3 |
Chicago |
18MAY04 |
24MAY04 |
Clark |
13 |
4 |
New York |
28MAY04 |
02JUN04 |
Clark |
10 |
5 |
Los Angeles |
01MAY04 |
08MAY04 |
Jackson |
19 |
1 |
Las Vegas |
11MAY04 |
18MAY04 |
Jackson |
20 |
2 |
Portland |
21MAY04 |
23MAY04 |
Jackson |
21 |
3 |
Seattle |
25MAY04 |
29MAY04 |
Jackson |
22 |
4 |
Miami |
02MAY04 |
07MAY04 |
Rogers |
23 |
1 |
Tampa |
11MAY04 |
15MAY04 |
Rogers |
24 |
2 |
New Orleans |
18MAY04 |
24MAY04 |
Rogers |
25 |
3 |
Houston |
28MAY04 |
01JUN04 |
Rogers |
26 |
4 |
Charlotte |
02MAY04 |
04MAY04 |
Stevens |
14 |
1 |
Atlanta |
08MAY04 |
10MAY04 |
Stevens |
15 |
2 |
Dallas |
12MAY04 |
15MAY04 |
Stevens |
16 |
3 |
Denver |
17MAY04 |
20MAY04 |
Stevens |
17 |
4 |
Nashville |
27MAY04 |
02JUN04 |
Stevens |
18 |
5 |
Charlotte |
04JUN04 |
06JUN04 |
Stevens |
14 |
6 |
Output 8.24.2
Multisegment Gantt Chart
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