I want the max date but only look at rows with a certain category value.

Question

I want a way to get the max date but only look at rows with a certain category value - ignoring the other rows.  My detail table contains expenditures including date (col A) and category (col D) the number of rows will increase with expenditures over time.  My summary table will have a cell for each category and display the last expense date for that category using a functionality that I must ask of you, dear community.
I am using the latest numbers on an iPad (4) with IOS6.
Secondarily, I would like to add another cell in the summery table with the value (col E) of the last expense for each category.
Thank you,
Warren

Answer 1

...later...
With the addition of an auxiliary column to the Main table, a second header row to the Most recent table, and a minor modification to the formula on the second table, the tables can handle a range of dates set by entering the first and last date into A1 abd B1 respectively of the summary table, Most recent.
Note that the selected range, shown with a green background in the auxiliary column, does not contain any category B expenses. Using LOOKUP, this would result in a repeat of the January 6 expense bering listed in this row. Switching to VLOOKUP, which can be set to require an exact match, allows the result shown—if there are no expenses in a given category, the formula returns "none" (or whatever message you substitute for "none" in the formula in that column).
Formulas:
Main::A2: =IF(OR(B<Most recent :: $A$1,B>Most recent :: $B$1),"x"&E,E)
Fill down to the end of column A.
This column must be located on the left side of the table (ie. must be column A), but may be hidden.
Most recent::A2: =IFERROR(VLOOKUP($D,Main :: $A:$D,COLUMN()+1,FALSE),"none")
"FALSE" will display as "Exact match" in Numbers's formula editor.
Fill down to the end of the table and right to column C.
Regards,
Barry