sch_validate

<p>Validate your schedule in terms of structure: cannot have duplicated activity
id, all 'from' and 'to' relation id must exist in activities tibble
and cannot have duplicated relation. This function is called by
<code>sch_plan(plan)</code>. If there is an error, the  schedule cannot be calculated.</p>


An R implementation of the Critical Path Method (CPM).
CPM is a method used to estimate the minimum project duration and determine
the amount of scheduling flexibility on the logical network paths within the
schedule model. The flexibility is in terms of early start, early finish,
late start, late finish, total float and free float. Beside, it permits
to quantify the complexity of network diagram through the analysis of
topological indicators. Finally, it permits to change the activities duration
to perform what-if scenario analysis. The package was built based on following
references: To make topological sorting and other graph operation, we use
Csardi, G. & Nepusz, T. (2005)
<https://www.researchgate.net/publication/221995787_The_Igraph_Software_Package_for_Complex_Network_Research>;
For schedule concept, the reference was Project Management Institute (2017)
<https://www.pmi.org/pmbok-guide-standards/foundational/pmbok>;
For standards terms, we use Project Management Institute (2017)
<https://www.pmi.org/pmbok-guide-standards/lexicon>;
For algorithms on Critical Path Method development, we use
Vanhoucke, M. (2013) <doi:10.1007/978-3-642-40438-2> and
Vanhoucke, M. (2014) <doi:10.1007/978-3-319-04331-9>;
And, finally, for topological definitions, we use
Vanhoucke, M. (2009) <doi:10.1007/978-1-4419-1014-1>.

sch_validate: Validate Schedule

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