I have a Dataset that stores the relationships between people IDs (in columns) and the events they attended (in rows). I want to produce a linear text report of those relationships. How can I do this in a way that is good/best practice optimised for Mathematica?
Dataset dsMeetings2 is of the form ' a table with named columns' The number '1' signifies that a person (represented by a column - 4 onwards) attended an event
This dataset can be arbitrarily large : so, variable columns, variable rows.
dsMeetings2 = Dataset@{{<|"id" -> 1, "date" -> "1/03/20", "name" -> "subject-1",
"100" -> 1, "106" -> 1, "101" -> 1, "105" -> 1, "102" -> 1,
"104" -> 0, "108" -> 0, "103" -> 0, "109" -> 0,
"111" -> 0|>, <|"id" -> 2, "date" -> "8/03/20",
"name" -> "subject-2", "100" -> 1, "106" -> 1, "101" -> 1,
"105" -> 1, "102" -> 0, "104" -> 0, "108" -> 0, "103" -> 1,
"109" -> 0, "111" -> 0|>, <|"id" -> 3, "date" -> "15/03/20",
"name" -> "subject-3", "100" -> 1, "106" -> 1, "101" -> 0,
"105" -> 1, "102" -> 1, "104" -> 1, "108" -> 0, "103" -> 0,
"109" -> 0, "111" -> 0|>, <|"id" -> 4, "date" -> "22/03/20",
"name" -> "subject-4", "100" -> 1, "106" -> 0, "101" -> 0,
"105" -> 0, "102" -> 0, "104" -> 0, "108" -> 1, "103" -> 1,
"109" -> 1, "111" -> 0|>, <|"id" -> 5, "date" -> "29/03/20",
"name" -> "subject-5", "100" -> 1, "106" -> 0, "101" -> 1,
"105" -> 1, "102" -> 1, "104" -> 1, "108" -> 0, "103" -> 0,
"109" -> 1, "111" -> 0|>, <|"id" -> 6, "date" -> "5/04/20",
"name" -> "subject-6", "100" -> 1, "106" -> 0, "101" -> 0,
"105" -> 1, "102" -> 0, "104" -> 0, "108" -> 0, "103" -> 1,
"109" -> 1, "111" -> 1|>}}
First, I identify the headers:
PersonIDs =
Keys[dsMeetings2[1, Range[4, Dimensions[dsMeetings2][[2]]]] ]
Next, I declare a function fnT to report the relationship
fnT[a_, b_] := Module [{ret = Null},
ret = ToString[
"id:\"" <> a <> "\" is-related-to PersonID:\"" <> b <> "\""]; ret
]
Then, I iterate through the table with those keys
result = (If [#[[2]] == 1, fnT[ToString[#[[1]]], Keys[#][[2]]],
""]) & /@ dsMeetings2[ # &, {"id", #}] & /@ PersonIDs //
Normal // TableForm
Which results in a report like this:
id:"1" is-related-to PersonID:"100"
id:"2" is-related-to PersonID:"100"
id:"3" is-related-to PersonID:"100"
(* ... *)
id:"5" is-related-to PersonID:"105"
id:"6" is-related-to PersonID:"105"
(*............etcetera...............*)
One issue with this approach is that it reports a "blank" line where there is no relationship, which is inefficient.
Could a better Functional Programming (FP) approach be used so it reports only when there is a relationship?
Also, I would value suggestions on how this can be made more readable/maintainable.. I am new to FP, thanks.
