Dimension to show only one month of data

[#1]

I have a bar chart that i'd like to only show the last month worth of data using the field [MonthYear], how would I go about doing that?

Thanks

[sunny_talwar]

May be use a calculated dimension

If(MonthYear = Max(TOTAL MonthYear), MonthYear)

or use set analysis

{<MonthYear = {"$(=Max(MonthYear))"}>}