sch_predecessors {criticalpath}

Predecessors

Description

List the direct predecessors of an activity.

Usage

sch_predecessors(sch, id)

Arguments

sch

A schedule object.

id

Activity id to be listed.

Value

A vector with all activities ids.

See Also

sch_gantt_matrix(), sch_all_successors(), sch_is_redundant(), sch_all_predecessors(), sch_successors(), sch_activities(), sch_relations().

Examples

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( 2L, "a2" , 4L,  5L, 12L) %>%
  sch_add_activity( 3L, "a3" , 9L, 10L) %>%
  sch_add_activity( 4L, "a4" , 1L,  6L) %>%
  sch_add_activity( 5L, "a5" , 4L,  9L) %>%
  sch_add_activity( 6L, "a6" , 5L,  7L) %>%
  sch_add_activity( 7L, "a7" , 1L,  8L,11L) %>%
  sch_add_activity( 8L, "a8" , 7L, 12L) %>%
  sch_add_activity( 9L, "a9" , 8L, 12L) %>%
  sch_add_activity(10L, "a10", 3L, 12L) %>%
  sch_add_activity(11L, "a11", 3L, 12L) %>%
  sch_add_activity(12L, "a12", 0L) %>%
  sch_plan()
sch_predecessors(sch, 2) # nothing
sch_predecessors(sch, 7) # 6
sch_predecessors(sch, 10) # 3