FormulaR1C1的这行是什么意思？

Question

I get what FormulaR1C1 means from this link .
But I couldn't get it when it was used with an ampersand & in VBA and Vlookup here in this line:

.Range(Cells(2, 3), Cells(2, 79)).FormulaR1C1 = "=VLOOKUP(RC1&R1C,POR_Vert!C4:C6,3,FALSE)"

Answer 1

RC1 translates to this row , column 1. R1C translates to row 1, this column .

So if you're writing this formula to cells(2,3) (which is $C$2 ) then it is interpreted as:

"=VLOOKUP($A2 & C$1,POR_Vert!$D:$F,3,FALSE)"

So, for example, if $A2 contains "Searc" and C$1 contains "hKey" then it would be the equivalent of:

"=VLOOKUP(RC1 & R1C,POR_Vert!C4:C6,3,FALSE)"         'becomes..
"=VLOOKUP($A2 & C$1,POR_Vert!$D:$F,3,FALSE)"         'becomes..
"=VLOOKUP("Searc" & "hKey",POR_Vert!$D:$F,3,FALSE)"  'becomes..
"=VLOOKUP("SearchKey",POR_Vert!$D:$F,3,FALSE)"

Answer 2

& is the concatenation operator so the lookup value is column A of the current row with row 1 of the current column appended to it. So in C2, you are taking the value of A2 and appending C1 to the end, then looking up the result.