This page demonstrates my method for creating formula evaluation. I have created some VBA code that allows you to find the sources and explanation of a formula by pressing a single short-cut key. You can quickly go to different source cells; you can quickly find the sources of LOOKUP and SUMIF formulas; you can see the formula in descriptive terms; you can keep looking deeper and deeper into formulas, and you can do this all without using the blue precedent hours. I know there are other similar programs that do this and many of them are not free. But with the VBA code shown below, you can customize the presentation and what you really need. You also do not need any add-in; instead you just have to have the GENERIC MACROS program open. Alternatively, you can copy the VBA code that is described below into your own personal macros program. The GENERIC MACROS program is attached to the button below.
I originally made the program because the CNTL, [ short-cut is difficult to find on a German keyboard or an Italian keyboard. My friend Sasha who is a very good modeller told me he could not find the CNTL [ key effectively. I told him that I would try and create a simple short-cut. Well, the short-cut key is not at all easy to replicate with simply recording the CNLT [ key and it does not work. Further, the CNTL [ key kind of sucks. If you have a complex formula, it only gives you the first component; it does not at all help with LOOKUP, which is my favorite; it does not give you any descriptive information. So now when you open GENERIC MACROS and press the ALT, U short-cut sequence, you get the following screen (that you can easily modify). When you place yourself on a cell in excel and press the ALT and u sequence, you will get a screen that looks something like the screen below. Note that I am sure I will change this many times in the future and I am sure you can make the screen that comes from the userform much more artistic.
When you have this screen, you can click on one of the items in the list box and you will see a similar layout. You can also go to the bottom and then click on one of the cells to go to that cell just like if you used the CNTL [ short-cut in excel. Once you go to the cell you can also press the F5, just like if you were using the sequence CNTL [ and F5 in your model.
If you have a SUMIF or LOOKUP in your model, I made the program work a little differently. In this case, the screen shows the entire rows that are used in the formula. Again, the formula shows the description of what is happening. In the screenshot below, I have moved the userform around so you can see the original formula.
Using the Split Function
The message box below illustrates the results of using the SPLIT function which is useful in working with the range names. You can split using different delimeters
The message box that splits up the equation is created by the following VBA code. Note that you create an array to create these parts
split_lookup = Split(cell_string_original, "(") split_inside_range = Split(split_lookup(1), ")") first_range = lookup_range(0) second_range = lookup_range(1) third_range = lookup_range(2) If debug_code = 12 Then _ MsgBox " Cell String " & cell_string_original & Chr(10) & _ " First Cell Range " & first_range & Chr(10) & _ " Third Cell Range " & third_range & Chr(10) & _ " Second Range " & second_range first_number_range = Split(first_range, ":") third_number_range = Split(third_range, ":") first_cell_range = first_number_range(0) third_cell_range = third_number_range(0) If debug_code = 12 Then _ MsgBox " First Cell Range " & first_cell_range & Chr(10) & _ " Third Cell Range " & third_cell_range & Chr(10) & _ " Second Range " & second_range
Step 1: Start of the Program. Get the Formula and then Test if it is a Formula
The first step is to define the formula. You can use the the ACTIVECELL.SELECT function. With this you can get the row and the column and then find the formula. The code just below shows how you can make sure to only do the whole thing if the cell is a formula — not a text; not an error; not a number. If this happens, just go to the end of the program.
ActiveCell.Select row = Selection.row col = Selection.Column cell_string_original = Cells(row, col).Formula ' This is the start of everything. Find the formula selected
If WorksheetFunction.IsText(Cells(row, col)) = True Then GoTo finish_the_calculations: If WorksheetFunction.IsError(Cells(row, col)) = True Then GoTo finish_the_calculations: If WorksheetFunction.IsNumber(Cells(row, col)) = False Then GoTo finish_the_calculations:
Step 2: Use the Precedent Item and the SPLIT function to find Cells in the Same Sheet
‘ Part 1 — Precendents in the same sheet
On Error Resume Next this_sheet_precedents = Cells(row, col).DirectPrecedents.Count ' This creates additional shapes; there is no error if no dependents total_cells_in_formula = Val(this_sheet_precedents) ' start with teh total number of cells total_cells_same_sheet = Val(this_sheet_precedents) ' start with teh total number of cells precedent_string = Cells(row, col).DirectPrecedents.Address
' ' Take out $ signs so can replace formula ' For i = 1 To 30 temp_string = WorksheetFunction.Substitute(precedent_string, "$", "", 1) precedent_string = temp_string Next i For i = 1 To 30 temp_string = WorksheetFunction.Substitute(cell_string_original, "$", "", 1) cell_string_original = temp_string Next i precedent_array = Split(precedent_string, ",") ' This is a key formula that separates the array
Step 3: Compute the Outputs in Case where Cells are on the Same Page
‘ Once you have the precendent array defined, you can put together the output strings
target_length = 70 one_period = "." total_period = "" For found = 1 To total_cells_in_formula total_period = "" ' set the cell for periods to zero cell_range_found(found) = precedent_array(found - 1) ' the name of the cell row_of_range(found) = Range(cell_range_found(found)).row For j = 1 To 10 ' Go around 10 columns If WorksheetFunction.IsText(Cells(row_of_range(found), j)) Then string_found(found) = Cells(row_of_range(found), j).Value display_string(found) = string_found(found) & "" & cell_range_found(found) temp_length = Len(display_string(found)) ' this is to derive the number of dots or spaces added_length = target_length - temp_length ' this is the number of dots to add For k = 1 To added_length ' go around one by one and add the dots total_period = total_period & one_period ' creates a string with dots Next k display_string(found) = string_found(found) & " " & total_period & " " & cell_range_found(found) Exit For End If Next j Next found
Step 4: Compute the Number of Explanation Points to Find Cells in Other Sheets
‘ Count the exclamation points for range names in other sheets
number_of_exclamations = 0 exclamation(1) = 2 cell_string_test = cell_string_original For i = 2 To 10 exclamation(i) = 0 Next i For i = 2 To 10
' On Error GoTo end_of_exclamation_loop: ' Note how the error trap does not work' On Error Resume Next exclamation(i) = WorksheetFunction.Find("!", cell_string_test, exclamation(i - 1) + 1) ' seems to convert ; -- look after the first argument If exclamation(i) = 0 Then Exit For If exclamation(i) <> exclamation(i - 1) Then number_of_exclamations = number_of_exclamations + 1 Next i total_cells_in_formula = total_cells_in_formula + number_of_exclamations ' start with teh total number of cells If number_of_exclamations > 0 Then start_count = total_cells_same_sheet found_count = start_count