>> x = round(100*rand(1,60))
x = 16 79 31 53 17 60 26 65 69 75 45 8 23 91 15 83 54 100 8 44 11 96 0 77 82 87 8 40 26 80 43 91 18 26 15 14 87 58 55 14 85 62 35 51 40 8 24 12 18 24 42 5 90 94 49 49 34 90 37 11
>> v1 = x(find(x<10))
v1 = 8 8 0 8 8 5
>> v2 = x(find(and(x>=10,x<50)))
v2 = 16 31 17 26 45 23 15 44 11 40 26 43 18 26 15 14 14 35 40 24 12 18 24 42 49 49 34 37 11
>> v3 = x(find(and(x>50,x<100)))
v3 = 79 53 60 65 69 75 91 83 54 96 77 82 87 80 91 87 58 55 85 62 51 90 94 90
>> sum(v1)
ans = 37
>> sum(v2)
ans = 799
>> sum(v3)
ans = 1814
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