using a dictionary and array to count cell values

Question

This is an extension of this question. I want to do something similar, but I am not very familiar with dictionary objects, and the code provided in the answer is very advanced, so I am having trouble understanding it. For instance, some of the syntax is not very clear, and variable names are not very obvious/intuitive. I am creating a new question because the original problem has been solved.

I want to do exactly the same thing as in the linked question, but instead of counting cell values in column H, I want to count AOI entries (and ignore exits) per trial and block in column I, and print the number in column U.

If you could also provide an explanation of the solution to accompany your solution (so that I understand what is going on), that would be appreciated. Or at least explain what is going on in the previous solution.

Here is a link to my most up to date sample data and code.

Answer 1

I've figured it out. Here is the code:

Dim dBT As Object 'global dictionary

Sub buttonpresscount()

    'constants for column positions
    Const COL_BLOCK As Long = 1
    Const COL_TRIAL As Long = 2
    Const COL_ACT As Long = 7
    Const COL_AOI As Long = 8

    Dim rng As Range, lastrow As Long, sht As Worksheet
    Dim d, r As Long, k, resBT()

    Set sht = Worksheets("full test")
    lastrow = Cells(Rows.Count, 3).End(xlUp).Row
    Set dBT = CreateObject("scripting.dictionary")

    Set rng = sht.Range("B7:I" & lastrow)

    d = rng.Value  'get the data into an array

    ReDim resBT(1 To UBound(d), 1 To 1) 'resize the array which will
                                        '  be placed in ColT

    'get unique combinations of Block and Trial and pressedcounts for each
    For r = 1 To UBound(d, 1)
        k = d(r, COL_BLOCK) & "|" & d(r, COL_TRIAL) 'create key
        dBT(k) = dBT(k) + IIf(d(r, COL_ACT) <> "", 1, 0)
    Next r

    'populate array with appropriate counts for each row
    For r = 1 To UBound(d, 1)
        k = d(r, 1) & "|" & d(r, 2)   'create key
        resBT(r, 1) = dBT(k)          'get the count
    Next r

    'place array to sheet
    sht.Range("T7").Resize(UBound(resBT, 1), 1) = resBT

    'clear dictionary
    dBT.RemoveAll

'count AOI entries
 For r = 1 To UBound(d, 1)
        k = d(r, COL_BLOCK) & "|" & d(r, COL_TRIAL) 'create key
        dBT(k) = dBT(k) + IIf(d(r, COL_AOI) = "AOI Entry", 1, 0)
    Next r

    'populate array with appropriate counts for each row
    For r = 1 To UBound(d, 1)
        k = d(r, 1) & "|" & d(r, 2)   'create key
        resBT(r, 1) = dBT(k)          'get the count
    Next r

    'place array to sheet
    sht.Range("U7").Resize(UBound(resBT, 1), 1) = resBT


End Sub

I basically duplicated the previous code, added another constant for the relevant column and changed the relevant references to columns, and made sure to clear the dictionary inbetween counting tasks.