Custom formula in cross-tab?

Question

I have a cross-tab like this
                  JAN    FEB    MAR ....... DEC (the 12 months as columns)
year 2006
   item 01     150    205      300 .......    550
   item 02       80    190      284 ........   620
year 2007
   item 01      458    235      224 .......... 781
   item 02      154    254      134..........  254  
year 2008
   item 01       245    154      544           1243
   item 02       524    254      124 .........   924     
I want to know if is possible to have a formula that take the value of each month and compare with the previous and make a calcule like this...
                  JAN    FEB    MAR ....... DEC (the 12 months as columns)
year 2006
   item 01     150    205      300 .......    550
   item 02       80    190      284 ........   620
year 2007
   item 01      458    235      224 .......... 781
                   (205)   (14)
   item 02      154    254      134..........  254  
year 2008
   item 01       245    154      544           1243
   item 02       524    254      124 .........   924 
where (205) and   (14) are calculate from:
(205) = (150 - 458) * 100 / 150 I have to  make this operation for each month takin the values from item 01 from 2006 with the values from item 01 from 2007 and so on
Edited by: j jara on Jul 22, 2008 2:01 AM

Answer 1

Yes it is possible.
It would be easier in CR2008  where you have the ability to add Calculated Members.
In previous versions you would need to create a variable for each year and using the GridRowColumnValue function assign the current value to a variable. You would then need to add a second summary field as a "dummy" summary and in the Display string formula declare the variables and manipulate the values as you like and finally convert the output to string.