Wrong indices returned using Lookup for cells containing strings

[rcharan51]

i have two cell arrays(strings) of size 20X1 and 3X1. when i tried to lookup
larger cell array in the shorter one the indices returned are not correct.
My guess is that since the cells in the short array are not sorted in any
particular order, wrong indices are returned. Am i right? if so what is work
around for this?
any help is much appreciated. Thanks.
    
>> b=geo_ch(1:20, 1)
b =
{
  [1,1] = GEN
  [2,1] = GEN
  [3,1] = GEN
  [4,1] = GEN
  [5,1] = GEN
  [6,1] = GEN
  [7,1] = GEN
  [8,1] = GEN
  [9,1] = GEN
  [10,1] = GEN
  [11,1] = GEN
  [12,1] = GEN
  [13,1] = GEN
  [14,1] = GEN
  [15,1] = GEN
  [16,1] = GEN
  [17,1] = WEAK
  [18,1] = WEAK
  [19,1] = WEAK
  [20,1] = WEAK
}
>> a=trop1mix(4:6,1)
a =
{
  [1,1] = GEN
  [2,1] = WEAK
  [3,1] = MIX
}
>> id=lookup(a,b)
id =

   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   1
   3
   3
   3
   3

>>





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