Thank you, Duncan, Here “a” has the length of 24, and “b” has the length of 20 with numbers from 1 to 20 uniquely. I just want encode “a” from 1 to 20 based on “a” current order using “b”. So, a1[1] = b[1] = 1 a1[2] = b[2] = 5 a1[3] = a1[4] = b[3] = 8 (since third and fourth numbers are the same in “a”) a1[5] = a1[6] = b[4] = 9 a1[7] = b[5] = 14 a1[8] = b[6] = 20 a1[9] = b[7] = 3 a1[10] = a1[11] = b[8] = 10 ... a1[23] = b[19] = 15 a1[24] = b[20] = 19
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