VBA using ubound on a multidimensional array

Question

Ubound can return the max index value of an array  but in a multidimensional array  how would I specify WHICH dimension I want the max index of   For example  Dim arr 1 to 4  1 to 3  As Variant   In this 4x3 array  how would I have Ubound return 4  and how would I have Ubound return 3

User · Answer

You need to deal with the optional Rank parameter of UBound   Dim arr 1 To 4  1 To 3  As Variant Debug Print UBound arr  1      returns 4 Debug Print UBound arr  2      returns 3   More at  UBound Function  Visual Basic

User · Answer

This is a late answer addressing the title of the question  since that is what people would encounter when searching  rather than the specifics of OP s question which has already been answered adequately   Ubound is a bit fragile in that it provides no way to know how many dimensions an array has  You can use error trapping to determine the full layout of an array  The following returns a collection of arrays  one for each dimension  The count property can be used to determine the number of dimensions and their lower and upper bounds can be extracted as needed   Function Bounds A As Variant  As Collection     Dim C As New Collection     Dim v As Variant  i As Long      On Error GoTo exit function     i   1     Do While True         v   Array LBound A  i   UBound A  i           C Add v         i   i   1     Loop exit function      Set Bounds   C End Function   Used like this   Sub test       Dim i As Long     Dim A 1 To 10  1 To 5  4 To 10  As Integer     Dim B 1 To 5  As Variant     Dim C As Variant     Dim sizes As Collection      Set sizes   Bounds A      Debug Print  A has    amp  sizes Count  amp    dimensions       For i   1 To sizes Count         Debug Print sizes i  0   amp    to    amp  sizes i  1      Next i      Set sizes   Bounds B      Debug Print vbCrLf  amp   B has    amp  sizes Count  amp    dimensions       For i   1 To sizes Count         Debug Print sizes i  0   amp    to    amp  sizes i  1      Next i      Set sizes   Bounds C      Debug Print vbCrLf  amp   C has    amp  sizes Count  amp    dimensions       For i   1 To sizes Count         Debug Print sizes i  0   amp    to    amp  sizes i  1      Next i End Sub   Output   A has 3 dimensions  1 to 10 1 to 5 4 to 10  B has 1 dimensions  1 to 5  C has 0 dimensions

User · Answer

ubound arr  1     and   ubound arr  2

User · Answer

In addition to the already excellent answers  also consider this function to retrieve both the number of dimensions and their bounds  which is similar to John s answer  but works and looks a little differently   Function sizeOfArray arr As Variant  As String     Dim str As String     Dim numDim As Integer      numDim   NumberOfArrayDimensions arr      str    Array       For i   1 To numDim         str   str  amp       amp  LBound arr  i   amp    To    amp  UBound arr  i          If Not i   numDim Then             str   str  amp               Else             str   str  amp              End If     Next i      sizeOfArray   str End Function   Private Function NumberOfArrayDimensions arr As Variant  As Integer   By Chip Pearson   http   www cpearson com excel vbaarrays htm Dim Ndx As Integer Dim Res As Integer On Error Resume Next   Loop  increasing the dimension index Ndx  until an error occurs    An error will occur when Ndx exceeds the number of dimension   in the array  Return Ndx - 1      Do         Ndx   Ndx   1         Res   UBound arr  Ndx      Loop Until Err Number  lt  gt  0 NumberOfArrayDimensions   Ndx - 1 End Function   Example usage   Sub arrSizeTester       Dim arr 1 To 2  3 To 22  2 To 9  12 To 18  As Variant     Debug Print sizeOfArray arr    End Sub   And its output   Array 1 To 2  3 To 22  2 To 9  12 To 18

User · Answer

Looping D3 ways   Sub SearchArray       Dim arr 3  2  As Variant     arr 0  0     A      arr 0  1     1      arr 0  2     w       arr 1  0     B      arr 1  1     2      arr 1  2     x       arr 2  0     C      arr 2  1     3      arr 2  2     y       arr 3  0     D      arr 3  1     4      arr 3  2     z       Debug Print  Loop Dimension 1      For i   0 To UBound arr  1          Debug Print  arr    amp  i  amp     0  is    amp  arr i  0      Next i     Debug Print         Debug Print  Loop Dimension 2      For j   0 To UBound arr  2          Debug Print  arr 0     amp  j  amp     is    amp  arr 0  j      Next j     Debug Print         Debug Print  Loop Dimension 1 and 2      For i   0 To UBound arr  1          For j   0 To UBound arr  2              Debug Print  arr    amp  i  amp        amp  j  amp     is    amp  arr i  j          Next j     Next i     Debug Print     End Sub

[arrays] VBA using ubound on a multidimensional array

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