How do I tell Excel not to chart a cell? For example, chart area is Cell
C1:C28 there is an HLookup formula which look for a value in a different
sheet. The HLookup formula returns a value #DIV/0! in cell C28, but the
chart stills plot it. I want Cell C28 to be treated as nothing don't plot
it. If I deleted the HLookup formula in C28, Excel will not ploted it.