Viable format that would satisfy the requirements for transfering from Matlab to Excel.

I am dealing with a 4x4x4 matrix. It is easier to sent the results to Excel. I have the format as a "double" but Matlab does not like that when sending to Excel. Is there a viable format that would satisfy the requirements for transfering from Matlab to Excel.

Program:

    exl = actxserver('excel.application');
    exlWkbk = exl.Workbooks;
    exlFile = exlWkbk.Open(['C:\MATLAB7\work\Analysis_Excel.xlsm']);
    exlSheet1 = exlFile.Sheets.Item('Sheet1');
    exl.visible = true;
    for i=1:4
          for j=1:4
              for k=1:4
                  Affinity(i,j,k)=double(subs(Affinity0(i,j,k),{r,h},{7000,0.7071}))
              end
          end
      end
    exlSheet1.Range(['C' num2str(3)]).value=Affinity(1,1,1)
    exlSheet1.Range(['D' num2str(3)]).value=Affinity(1,1,2)
    ...

Error code:

Warning: ActiveX - invalid argument type or value.
> In Analysis_Excel>Evaluate at 82

exlSheet1 =

  Interface.Microsoft_Excel_12.0_Object_Library._Worksheet

What type or value do they mean? Format other than double?