Re: Wrong indices returned using Lookup for cells containing strings

[rcharan51]

So sorting seems to solve the problem. Thank you guys.

Best Regards,

Raghu Charan A,

B. Tech (Hons) Civil Engineering (class of 2015),

School of Infrastructure,IIT Bhubaneswar, India.

Email: address@hidden, address@hidden
Mobile No: +91 8860567691, +91 7205733924


On Tue, Oct 20, 2015 at 6:51 PM, NJank [via Octave] <
address@hidden> wrote:

> On Tue, Oct 20, 2015 at 8:42 AM, Olaf Till <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=4673021&i=0>> wrote:
>
>> On Tue, Oct 20, 2015 at 08:25:21AM -0400, Nicholas Jankowski wrote:
>> > On Tue, Oct 20, 2015 at 8:06 AM, Olaf Till <[hidden email]
>> <http:///user/SendEmail.jtp?type=node&node=4673021&i=1>> wrote:
>> >
>> > > On Tue, Oct 20, 2015 at 02:37:15AM -0700, rcharan51 wrote:
>> > > > 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
>> > >
>> > > But the above seems correct to me ... Olaf
>> > >
>> > >
>> > I assume he's expecting 1's followed by 2's. I've never used lookup for
>> > non-numerical arrays, but I know it generally expects a to be monotonic.
>> > the help says for strings "lookup is performed using lexicographical
>> > comparison".  I notice his a is 'lexocographically' monotonic but b is
>> > not.  is that the source of his confusion?  Olaf, can you explain why
>> the
>> > output of 3 should be expected, rather than the 2 he was expecting?
>>
>> No, I can't. I just mixed it up in my head. That's the second time
>> today, seems it's not my day ... And you are surely right with the
>> table having to be monotonic. So 'a = sort (a)' should solve the
>> problem ...
>>
>>
> Nope. lookup(sort(a),b) produces the same output.
>
> Also, I was curious to see if Matlab produced the same results. turns out
> it errors when presented with cell arrays.
>
> >> id = lookup(a,b)
> Undefined function 'lookup' for input arguments of type 'cell'.
>
>
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