Re: Wrong indices returned using Lookup for cells containing strings

[Francesco Potortì]

>> Yes.  When doing lookup(TABLE, Y), TABLE must be sorted.  This is not
>> clear from the docs, I filed a bug report.
>>
>
>Hmm, then why did I get the same output for
>
>>> lookup(a,b)
>
>And
>
>>> lookup(sort(a),b)

Chance.  I assume that the lookup algorithm is not defined for unsorted
input, and does not check for a sorted table for efficiency reasons.
Look at this:

>> lookup([1 2 3 4 5 6 7 8 9], [3 5])
ans =
   3   5
>> lookup([1 2 6 7 5 8 9 3 4], [3 5])
ans =
   2   9

>> lookup({"1" "2" "3" "4" "5" "6" "7" "8" "9"}, {"3" "5"})
ans =
   3   5
>> lookup({"1" "2" "6" "7" "5" "8" "9" "3" "4"}, {"3" "5"})
ans =
   2   9
>> 

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