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sdu0632 发表于 2010-3-22 00:22 I already have variables "i, discont, a", and I want to creat a variable of b as below. Thanks, i discount a b; 1 .97 2.7 =(0.97+0.94) + 0.7*0.93 2 .94 3.5 =(.97+.94+.93)+0.5*0.90 3 .93 4.1 =(0.97+0.94+0.93+0.90)+0.1*0.85 4 .90 5 .85