czardas

Row Sum (Σ) Formula Validation

18 posts in this topic

#1 ·  Posted (edited)

Much work still needs to be done on my current project, but design concepts often benefit more from early criticism. Although there may be nothing particularly innovative about this project, user experience is everything. I would like you to look at the behaviour of the controls on this GUI. Unless you type something really awful, it allows you to finish typing the formula before testing the input. When typing into an edit control, pressing the enter key activates the okay button.

The program itself, mainly consists of a listview control, which you can't see - just imagine it looks like a stone age version of Excel with a nice paint job, but no bells or whistles. What Row Sum (Σ) is intended to do is loop through all the rows, calculate a sum and print the output in a newly created column. The user is prompted to type a formula into the following GUI. Please try to figure it out, and break it any way you can.

#include <GUIConstants.au3>
#include <GuiEdit.au3>
#include <Misc.au3>

Global $g_iAvailableCols = 24 ; arbitary dev variable [column count will eventually be read from a listview control]

; missing several thousand lines of code...

Formula()

; caution about including columns containing empty fields in the formula
; empty fields are treated as zero
; with addition and subtraction there is never any problem
; multiplication by an empty field (or by zero) returns zero
; division by an empty field (or by zero) returns an empty field [unless - see exception]
; use of the power operator is limited to rows in which all referenced fields contain numbers
; imaginary roots of negative numbers return an empty field [unless - see exception]
; exception: infinity (or an imaginary number) to the power of zero returns a meaningless number

Func FormulaSyntax()
    MsgBox(BitOR(64, 8192), "Row Sum (" & ChrW(0x03A3) & ") : Syntax To Use", _ ; $MB_ICONINFORMATION, $MB_TASKMODAL
    " mathematical operators :" & @TAB & "+ - * / ^" & @CRLF & _
    " column numbers :" & @TAB & @TAB & "c1, c2, c3  etc..." & @CRLF & _
    " decimal digits :" & @TAB & @TAB & "0 to 9 and ." & @CRLF & _
    " parenthesis :" & @TAB & @TAB & "( )" & @CRLF & _
    " minus sign :" & @TAB & @TAB & "-1, -c2, -(c3)  etc..." & @CRLF & _
    " example :" & @TAB & @TAB  & @TAB & "c1 +c2 -c3")
EndFunc ;==> FormulaSyntax

Func Formula() ; ($hParent, $idListView, $hListView) ; [missing parent window]
    Local $sTitle = "Row Sum (" & ChrW(0x03A3) & ")", _
    $iStyle = BitOR($WS_CAPTION, $WS_POPUP, $WS_SYSMENU), _
    $iExStyle = BitOR($WS_EX_MDICHILD, $WS_EX_TOOLWINDOW, $WS_EX_TOPMOST)

    Local $hChild = GUICreate($sTitle, 334 +25, 105 +1, Default + 100, Default + 100); , $iStyle, $iExStyle, $hParent)

    Local $hLabel = GUICtrlCreateLabel("Formula :", 8, 8, 55, 18)
    GUICtrlSetFont(-1, 10)

    Local $hSyntax = GUICtrlCreateButton("???", 72, 7, 40, 20)

    Local $hLabel = GUICtrlCreateLabel("Header :", 127, 8, 49, 18)
    GUICtrlSetFont(-1, 10)

    Local $hHeader = GUICtrlCreateInput("", 182, 7, 170, 20)
    GUICtrlSetFont(-1, 10)

    Local $hInput = GUICtrlCreateInput("", 7, 33, 320 +25, 40, BitOR($WS_TABSTOP, $ES_MULTILINE))
    GUICtrlSetFont(-1, 10)

    Local $hCheckBox = GUICtrlCreateCheckbox(" Round to", 7, 79, 75, 20)
    GUICtrlSetFont(-1, 10)

    Local $hPlaces = GUICtrlCreateInput("2", 86, 79 +1, 20, 20, BitOR($WS_TABSTOP, $ES_CENTER, $ES_NUMBER))
    GUICtrlCreateLabel("decimal places", 114 -2, 79 +2, 92, 18)
    GUICtrlSetFont(-1, 10)

    Local $hCancel = GUICtrlCreateButton("Cancel", 210, 79 +1, 66, 20)

    Local $hOkay = GUICtrlCreateButton("OK", 285, 79 +1, 66, 20)
    GUISetState(@SW_SHOW)

    Local $sInput = "", $aArray, $iError = 0, $iCols = $g_iAvailableCols ; $iCols = _GUICtrlListView_GetColumnCount($hListView), _ ; >>> CHANGE THIS LATER
    ;$iRows = _GUICtrlListView_GetItemCount($hListView), $aColOrder = _GUICtrlListView_GetColumnOrderArray($hListView)

    Local $vTemp, $msg2, $iPlaces = '2'
    While 1
        $msg2 = GUIGetMsg()
        If $msg2 = $hCancel Or $msg2 = $GUI_EVENT_CLOSE Then ExitLoop

        If $msg2 = $hSyntax Then
            FormulaSyntax()
            ContinueLoop
        EndIf

        $vTemp = GUICtrlRead($hPlaces)
        If $vTemp <> $iPlaces Then
            If $vTemp > 14 Then
                GUICtrlSetData($hPlaces, 14)
                $iPlaces = 14
                _GUICtrlEdit_SetSel($hPlaces, 0, -1)
            ElseIf Not $vTemp Then
                GUICtrlSetData($hPlaces ,'0')
                $iPlaces = '0'
                _GUICtrlEdit_SetSel($hPlaces, 0, -1)
            EndIf
        EndIf

        If BitAND(GUICtrlRead($hCheckBox), $GUI_CHECKED) == $GUI_CHECKED _
            And BitAND(GUICtrlGetState($hPlaces), $GUI_DISABLE) == $GUI_DISABLE Then
            GUICtrlSetState($hPlaces, $GUI_ENABLE)
        ElseIf BitAND(GUICtrlRead($hCheckBox), $GUI_CHECKED) <> $GUI_CHECKED _
            And BitAND(GUICtrlGetState($hPlaces), $GUI_ENABLE) == $GUI_ENABLE Then
            GUICtrlSetState($hPlaces, $GUI_DISABLE)
        EndIf

        $sFormula = GUICtrlRead($hInput)

        If $sFormula <> $sInput Then
            If StringRegExp($sFormula, '[^ ]') Then ; spaces between components are ignored

                If Not ValidSyntax($sFormula, $iCols) Then
                    If @extended < 5 Then
                        If $iError = 0 Then GUICtrlSetBkColor($hInput, 0xFFA090)
                        $iError = 1
                    ElseIf $iError Then
                        GUICtrlSetBkColor($hInput, 0xFFFFFF)
                        $iError = 0
                    EndIf

                ElseIf $iError Then
                    GUICtrlSetBkColor($hInput, 0xFFFFFF)
                    $iError = 0
                EndIf

            ElseIf $iError Then
                GUICtrlSetBkColor($hInput, 0xFFFFFF)
                $iError = 0
            EndIf
            $sInput = $sFormula
        EndIf

        ;  BitAND(WinGetState($hChild), $WIN_STATE_ACTIVE) = 8
        If $msg2 = $hOkay Or (_IsPressed("0D") And BitAND(WinGetState($hChild), 8) = 8 And (ControlGetFocus($hChild) = "Edit2" Or ControlGetFocus($hChild) = "Edit1")) Then
            $sFormula = GUICtrlRead($hInput) ;
            If StringRegExp($sFormula, '[^ ]') And ValidSyntax($sFormula, $iCols) Then
                ; missing formula execution code

                MsgBox(0, "VALID SYNTAX", "Well done, your formula can safely be executed, but" & @CRLF & "can't find parent window.")
                ExitLoop
            Else
                Switch @extended
                    Case 1
                        $vTemp = "The formula contains illegal characters."
                    Case 2
                        $vTemp = "No such column exists."
                    Case 3
                        $vTemp = "The formula contains a syntax error."
                    Case 4
                        $vTemp = "The formula is missing opening parenthesis."
                    Case 5
                        $vTemp = "The formula is unterminated"
                    case 6
                        $vTemp = "The formula is missing closing parenthesis."
                EndSwitch

                MsgBox(262160, "uh-uh!", StringRegExp($sFormula, '[^ ]') ? $vTemp : "Please enter a formula.")
                While _IsPressed("0D")
                    Sleep(50)
                WEnd
                ;$iError = 1
            EndIf
        EndIf
    WEnd
    GUIDelete($hChild)
EndFunc ; formula

Func ValidSyntax($sFormula, $iMax) ; [currently requires external check that string <> ""]
    ; quick test for accepted characters
    If StringRegExp($sFormula, '(?i)[^c \d\.\+\-\*/\^\(\)]') Then Return SetExtended(1, False) ; illegal characters
    If StringRegExp($sFormula, '(?i)\.\D|c[0\D]|\d\s+[\.\d]') Then Return SetExtended(3, False) ; syntax

    $sFormula = StringStripWS($sFormula, 8) ; strip all spaces

    ; split to separate formula components
    Local $aFormula = StringRegExp($sFormula, '(?i)\-?c\d+|\-?c|\-?\d*\.\d*|\-?\d+|\-\(|[\+\-\*/\^\(\)]|.+', 3), _ ; create array [ADDED] ==> |.+
    $iLast, $sTest, $sExpect = '(?i)\-?\(|\-?c\d+|\-?c|\-?\d*\.\d*|\-?\d+|\-', _ ; valid first component
    $iBracket = 0, $bSyntax = False, $bNoSuch = False, $bTermination = False ; error tracking variables

    For $i = 0 To UBound($aFormula) -1
        If Not StringRegExp($aFormula[$i], $sExpect) Then ; unexpected code sequence
            $bSyntax = True
            ExitLoop
        EndIf

        If StringRegExp($aFormula[$i], '(?i)\-?c\d+') Then ; column number
            $sTest = StringRegExpReplace($aFormula[$i], '(?i)[\-c]+', '')
            If $sTest > $iMax Or $sTest == 0 Then ; no such column exists
                $bNoSuch = True
                ExitLoop
            EndIf
            $sExpect = '[\+\-\*/\^\)]' ; operators / closing brackets

        ElseIf StringRegExp($aFormula[$i], '\-?\d*\.\d*') Then ; decimal
            If $aFormula[$i] == '.' Or $aFormula[$i] == '-.' Then
                If $i = UBound($aFormula) -1 Then
                    $bTermination = True
                    ExitLoop
                EndIf
                $bSyntax = True ; badly formated decimal
                ExitLoop
            EndIf
            $sExpect = '[\+\-\*/\^\)]' ; as above

        ElseIf StringRegExp($aFormula[$i], '\-?\d+') Then ; integer
            $sExpect = '[\+\-\*/\^\)]'

        ElseIf StringRegExp($aFormula[$i], '\A[\+\-\*/\^]\z') Then ; operator
            $iLast = UBound($aFormula) -1
            If $i = $iLast Or ($i = $iLast -1 And $aFormula[$iLast] == '-') Then
                $bTermination = True
                ExitLoop
            EndIf
            $sExpect = '(?i)\-?\(|\-?c\d+|\-?c|\-?\d*\.\d*|\-?\d+'

        ElseIf $aFormula[$i] == '(' Or $aFormula[$i] == '-(' Then ; opening bracket
            $iBracket += 1
            $sExpect = '(?i)\-?\(|\-?c\d+|\-?c|\-?\d*\.\d*|\-?\d+|\-'

        ElseIf $aFormula[$i] == ')' Then ; closing bracket
            $iBracket -= 1
            $sExpect = '[\+\-\*/\^\)]'

        ElseIf $aFormula[$i] = 'c' Or $aFormula[$i] = '-c' Then ; unterminated column number
            If $i = UBound($aFormula) -1 Then
                $bTermination = True
            Else
                $bSyntax = True
                ExitLoop
            EndIf

        Else ; unexpected exception [this should never happen]
            $bSyntax = True
            ExitLoop
        EndIf
        If $iBracket < 0 Then ExitLoop ; closing (unopened) parenthesis error

        ; [formula looks okay so far]
    Next

    ; better to be a bit wordy [for clarity]
    If $bNoSuch Then Return SetExtended(2, False) ; no such column exists
    If $bSyntax Then Return SetExtended(3, False) ; syntax error
    If $iBracket < 0 Then Return SetExtended(4, False) ; missing opening parenthesis
    If $bTermination Then Return SetExtended(5, False) ; formula may not terminate with operator or c
    If $iBracket > 0 Then Return SetExtended(6, False) ; missing closing parenthesis
    ; ConsoleWrite('valid' & @LF)
    Return True ; formula is correct
EndFunc ;==> ValidSyntax

 

Edited by czardas

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Just did a quick test.
You stated that "user experience is everything". I, as a user, would like to see the general error message "The formula you entered contains errors." replaced by helpful error messages like "no such column exists" etc.

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Thanks water :), how very true. I should have added that part: all the information is returned by ValidSyntax() with the @extended flag. I was just too lazy to add the final code (or distracted by other concerns). I was more wondering if I might have missed something while testing formula syntax.

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Just noticed that there is a limit of 24 columns. Would be fine to have this described in the help function :)


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#5 ·  Posted (edited)

The limit is a temporary measure. You can change it to any number you like > 0. Modify this line:

Global $g_iAvailableCols = 24 ; arbitary dev variable [column count will eventually be read from a listview control]

 

Edited by czardas

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I mean: Modify the help page to

" column numbers :" & @TAB & @TAB & "c1, c2, c3  etc. maximum is c" & $g_iAvailableCols & @CRLF & _

 


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ExcelChart (2015-04-01 - Version 0.4.0.0) - Download - General Help & Support - Example Scripts
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If the # of decimal places exceeds 14 then it is set to the # of allowed columns (now 24).
Is this intended by you?


My UDFs and Tutorials:

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OutlookEX (NEW 2017-02-27 - Version 1.3.1.0) - Download - General Help & Support - Example Scripts - Wiki
ExcelChart (2015-04-01 - Version 0.4.0.0) - Download - General Help & Support - Example Scripts
Excel - Example Scripts - Wiki
Word - Wiki
PowerPoint (2015-06-06 - Version 0.0.5.0) - Download - General Help & Support

Tutorials:
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Maybe, I get what you are saying. There will be a help menu topic. I wanted to know if it is possible to figure out what's going on without the need to refer to help topics. There has to be a quick syntax reference though. I'm just about to update the first post to include a more detailed error report.

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#9 ·  Posted (edited)

Oops, I missed your last question about decimal places (post #7): an error crept in on my first edit which I have now fixed. I also notice that the final error message doesn't entirely like the enter key when an edit control has focus. It's an easy fix.

Edit: The enter key issue has also been fixed now.

Edited by czardas

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#10 ·  Posted (edited)

Another validation bugfix, although you probably won't notice any difference. In theory it should be easy to quickly learn how to type a formula with just the information available. How easy do you think this is? Does the colour change assist you or annoy you?

Edited by czardas

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I like the colour change because it immediately tells me that the last letter/number I entered was wrong.

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ExcelChart (2015-04-01 - Version 0.4.0.0) - Download - General Help & Support - Example Scripts
Excel - Example Scripts - Wiki
Word - Wiki
PowerPoint (2015-06-06 - Version 0.0.5.0) - Download - General Help & Support

Tutorials:
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@water I couldn't ask for a better critic after all the work you have done creating the Excel UDF. I really appreciate you taking the time to try it. :thumbsup:

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Thanks :)


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ExcelChart (2015-04-01 - Version 0.4.0.0) - Download - General Help & Support - Example Scripts
Excel - Example Scripts - Wiki
Word - Wiki
PowerPoint (2015-06-06 - Version 0.0.5.0) - Download - General Help & Support

Tutorials:
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#14 ·  Posted (edited)

I've made some small improvements to the code in first post. I may change it to allow rounding up to 15 decimal places. Once I implement this code, it may become unrecognizable. While this may not be the most exciting topic of discussion, I'm also posting the code I've just written for rounding and formatting the executed formula, since it is part of the same module: it might also be of inspiration to someone. It is currently intended that the formula will return a double. The following code runs with all the safeties turned off (potentially returning up to 17 significant digits along with a load of zeros). The user will be advised (not forced) to remain within 15 significant figures when rounding. Trailing zero padding is added by default.

MsgBox(0, "", DecimalPlaces(Execute('0.30000000000000099'), 15))
MsgBox(0, "", DecimalPlaces(Execute('2/-3'), 15))
MsgBox(0, "", DecimalPlaces(Execute('-0.000000000000011 *3'), 15))
MsgBox(0, "", DecimalPlaces(Execute('10000000000000.01000000000000000'), 15))
MsgBox(0, "", DecimalPlaces(Execute('-123456789012345.6199123458989'), 3))
MsgBox(0, "", DecimalPlaces(1.8734176520787252e+004, 12)) ; lucky number!
MsgBox(0, "", DecimalPlaces(Execute('-000222222222222222922222222222222222222200.888888888888888*2'), 14))

; accepts doubles
Func DecimalPlaces($fNumber, $iPlaces = 2) ;, $bTrailingZeros = True) ; [add this option later along with program settings]
    ; error checks [magnitude maybe]
    $iPlaces = Int($iPlaces) ; max = 15
    $fNumber = Number($fNumber, 3) ; convert to double (just in case) [more complex routines could also be written: BigNum etc...]

    Local $bNeg = False
    If StringLeft($fNumber, 1) == '-' Then
        $bNeg = True
        $fNumber = Abs($fNumber)
    EndIf

    $fNumber = Round($fNumber, $iPlaces)

    Local $nDigits, $iExponent, $nOutput, $iLen, $iDot = StringInStr($fNumber, '.')
    If StringInStr($fNumber, 'e') Then
        $nDigits = StringReplace(StringRegExpReplace($fNumber, 'e[\+\-]\d+\z', ''), '.', '')
        $iLen = StringLen($nDigits)
        $iExponent = StringRight($fNumber, 4)
        If $iLen = 15 Then ; [uh-uh - rounding had no discernible effect on length]
            $iLen = $iExponent + $iPlaces +1
            $nDigits = __FloatToDigits($fNumber, (($iLen < 16) ? $iLen : 16)) ; return all 17 digits of the rounded double [it makes sense]
            $iExponent = @extended
            $iLen = StringLen($nDigits)
        Else
            $iExponent += (1 -$iLen)
        EndIf

    ElseIf $iDot And StringLen($fNumber) < 16 Then
        $nOutput = StringLeft($fNumber & '000000000000000', $iDot + $iPlaces)
        If $bNeg Then $nOutput = '-' & $nOutput
        Return $nOutput

    Else
        $iLen =  ($iDot ? $iDot : StringLen($fNumber)) + $iPlaces
        $nDigits = __FloatToDigits($fNumber, (($iLen < 16) ? $iLen : 16))
        $iExponent = @extended
        $iLen = StringLen($nDigits)
    EndIf

    Local $sZeros = '000000000000000'
    If $iExponent < 0 Then
        Local $iGap = $iLen + $iExponent
        If $iGap < 1 Then
            $nOutput = '0.' & StringLeft($sZeros, Abs($iGap)) & $nDigits
        Else
            $nOutput = StringLeft($nDigits, $iGap) & '.' & StringRight($nDigits, $iLen -$iGap)
        EndIf

        $iGap = $iLen -$iGap
        If $iGap < $iPlaces Then
            $nOutput &= StringLeft($sZeros, $iPlaces -$iGap)

        ElseIf $iGap > $iPlaces Then ; this one slipped through the net
            Local $bAddOne = (StringMid($nOutput, StringInStr($nOutput, '.') +$iPlaces +1, 1) >= 5) ? True : False ; round up
            $nOutput = StringTrimRight($nOutput, $iGap -$iPlaces)

            If $bAddOne Then ; when all else fails, use the old fashioned method
                Local $vNext, $nRound
                For $i = StringLen($nOutput) To 1 Step -1
                    $vNext = StringMid($nOutput, $i, 1)
                    If $vNext = '.' Then
                        $nRound &= '.'
                    Else
                        $vNext += 1
                        If $vNext < 10 Then
                            $nRound &= $vNext
                            $nOutput = StringLeft($nOutput, $i -1) & StringReverse($nRound)
                            $bAddOne = False
                            ExitLoop ; this should happen on the first run [does this loop ever actually repeat?]
                        EndIf
                        $nRound &= '0'
                    EndIf
                Next
                If $bAddOne Then $nOutput = '1' & StringReverse($nRound)
            EndIf
        EndIf

    Else
        While StringLen($sZeros) < $iExponent
            $sZeros &= '000000000000000'
        WEnd

        $nOutput = $nDigits & StringLeft($sZeros, $iExponent) & '.' & StringLeft('000000000000000', $iPlaces)
    EndIf

    If $iPlaces = 0 Then $nOutput = StringReplace($nOutput, '.', '')
    If $bNeg And StringRegExp($nOutput, '[1-9]') Then $nOutput = '-' & $nOutput

    Return $nOutput
EndFunc ;==> DecimalPlaces

; function taken from : Fraction.au3
; #INTERNAL_USE_ONLY# ==========================================================================================================
; Name...........: __FloatToDigits
; Description ...: Extracts a specified number of digits from a float.
; Syntax.........: __FloatToDigits($fFloat, $iDigits)
; Parameters.....; $fFloat - The float to extract the digits from.
;                  $iDigits - The number of digits to extract after the floating point (exponential representation).
; Return values .: Success - Returns a 32-bit or 64-bit signed integer.
;                  Sets @extended to the decimal exponent. ==> $fFloat = return value * 10 ^ exponent
;                  Failure sets @error to 1 if the input is not a float or undefined.
; Author ........: czardas
; ==============================================================================================================================
Func __FloatToDigits($fFloat, $iDigits = 14)
    If VarGetType($fFloat) <> 'Double' Or StringInStr($fFloat, '#') Then Return SetError(1)
    Local $iSign = ($fFloat < 0) ? -1 : 1
    ; machine epsilon = 5 × 10^-15, so the final two digits (16 and 17) could be highly innacurate
    $fFloat = StringFormat('%.' & $iDigits & 'e', $fFloat) ; rounds to the specified number of decimal places

    Local $aFloat = StringSplit($fFloat, "e", 2) ; zero-based array
    If $iSign < 0 Then $aFloat[0] = StringTrimLeft($aFloat[0], 1) ; remove the minus sign

    ; remove the decimal point and trailing zeros
    $aFloat[0] = StringLeft($aFloat[0], 1) & StringRegExpReplace(StringRight($aFloat[0], $iDigits), '(0+\z)', '')
    $aFloat[1] += 1 - StringLen($aFloat[0]) ; adjust the exponent to accommodate changes

    Return SetExtended($aFloat[1], Int($aFloat[0]) * $iSign) ; add back the minus sign
EndFunc ;==> __FloatToDigits

There may yet be some superfluous (and therefore dubious) lines of code in the above example. I'll try removing them later, and see if it breaks anything. Which is worse, broken code or fuzzy human logic? :ermm:

Edited by czardas
code tidying

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Oh my! The worst is broken code with fuzzy human logic. I'm sure there must be a trick I can use like adding '.0' and just throwing the value into some engine designed by someone who can read the mind of the user.

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#16 ·  Posted (edited)

The above code has now been implemented and seems to work like a charm. I was also thinking of adding a column ratio feature, but I'm not sure how useful it might be. Here someone asks how to do this: http://stackoverflow.com/questions/472989/how-do-i-display-a-ratio-in-excel-in-the-format-ab , and I want to know why. Can you think of any practical applications?

Edited by czardas

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No, not really ;)

1 person likes this

My UDFs and Tutorials:

Spoiler

UDFs:
Active Directory (NEW 2017-04-18 - Version 1.4.8.0) - Download - General Help & Support - Example Scripts - Wiki
OutlookEX (NEW 2017-02-27 - Version 1.3.1.0) - Download - General Help & Support - Example Scripts - Wiki
ExcelChart (2015-04-01 - Version 0.4.0.0) - Download - General Help & Support - Example Scripts
Excel - Example Scripts - Wiki
Word - Wiki
PowerPoint (2015-06-06 - Version 0.0.5.0) - Download - General Help & Support

Tutorials:
ADO - Wiki

 

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I suppose application may be limited, but I think it looks nice. It can be useful in music theory or calculating betting odds, or if you just want to annoy people on stackoverflow. :D

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