| sch_activities {criticalpath} | R Documentation |
Return a tibble with all activities of a schedule in an insertion order. These are the main information calculated by CPM.
sch_activities(sch)
sch |
A schedule object. |
The tibble is formed by following structure:
id: Activity id.
name: The name of activity.
duration: A number that represents the activity's duration.
milestone: A milestone is an activity with zero duration.
This property indicates if an activity is a milestone or not:
TRUE indicates it is a milestone; FALSE indicates it is not.
critical: A critical activity is one with total float minor or equal
to zero. This property indicates if an activity is critical:
TRUE indicates it is critical;
FALSE indicates it is not critical.
early_start: Is the earliest start period an activity can begin after its predecessors without violating precedence relation.
early_finish: Is the early start plus activity duration.
late_start: Is the late finish minus activity duration.
late_finish: Is the latest finish an activity can finish before their successors without violating precedence relation.
total_float: It is the amount of period an activity can be delayed without violating the project duration. Its formula is: late_start - early_start or late_finish - early_finish
free_float: It is the amount of period an activity can be delayed without violating the start time of the successors activities.
progr_level: It is the rank of activities counted from begin. The level of the activities that don't have predecessor is one; the level of the other activities, is one plus the maximal level of their predecessor.
regr_level: Regressive level is the rank of activities counted from the end. The level of the activities that don't have successor is the maximal progressive level; the level of the other activities, is one minus the minimal level of their successor.
topo_float: It is the difference between progressive level and regressive level.
A tibble with activities.
sch_has_any_activity(), sch_change_activities_duration(),
sch_add_activity(), sch_nr_activities(), sch_critical_activities(),
sch_add_activities(), sch_get_activity(), sch_duration().
sch <- sch_new() %>%
sch_title("Fictitious Project Example") %>%
sch_reference("VANHOUCKE, Mario. Measuring time:
improving project performance using earned value management.
Gent: Springer, 2009, p. 18") %>%
sch_add_activity( 1L, "a1" , 0L, 2,3,4) %>%
sch_add_activity( 2L, "a2" , 4L, 5) %>%
sch_add_activity( 3L, "a3" , 9L, 10) %>%
sch_add_activity( 4L, "a4" , 1L, 6) %>%
sch_add_activity( 5L, "a5" , 4L, 9) %>%
sch_add_activity( 6L, "a6" , 5L, 7) %>%
sch_add_activity( 7L, "a7" , 1L, 8,11) %>%
sch_add_activity( 8L, "a8" , 7L, 12) %>%
sch_add_activity( 9L, "a9" , 8L, 12) %>%
sch_add_activity( 10L, "a10", 3L, 12) %>%
sch_add_activity( 11L, "a11", 3L, 12) %>%
sch_add_activity( 12L, "a12", 0L) %>%
sch_plan()
sch_activities(sch)