data of corresponding column

HI,

I have many columns, I need to find corresponding data between two columns and summation from one column based on the condition of another column .

for example, the column A should be more than 600, then sum of the column B (based on the conditions in column A- more than 600).

thank you! really hope someone can help me out from this!

Answer 1

[KSSV]

idx = columnA > 600 ; 
iwant = sum(columnB(idx)) ;