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Re: Exporting a List of Tables with different Lengths to a tabulator

  • To: mathgroup at smc.vnet.net
  • Subject: [mg110652] Re: Exporting a List of Tables with different Lengths to a tabulator
  • From: hemke <h.maeter at gmail.com>
  • Date: Wed, 30 Jun 2010 08:05:48 -0400 (EDT)
  • References: <i0cor7$bug$1@smc.vnet.net> <i0eluk$dn3$1@smc.vnet.net>

Thanks a lot, Sjoerd! This is exactly what I was looking for. I wasn't 
aware of the Null symbol...

Hemke

Sjoerd C. de Vries schrieb:
> Hi Hemke,
> 
> My solution uses PadRight to make all matrices have the same lengths,
> and ArrayFlatten to combine all matrices in a single rectangular one.
> 
> Some example matrices:
> 
> m = {{1, 2, 3}, {4, 5, 6}};
> n = {{7, 8, 9}, {1, 2, 3}, {4, 5, 6}};
> o = {{2, 4, 6}, {1, 3, 5}, {9, 7, 5}, {8, 6, 4}};
> 
> listA = {m, n, o};
> 
> The code:
> 
> mostRows = Max[Length /@ listA];
> numColumns = Length[listA[[1, 1]]]; (*assumes, as given, that all
> matrices have the same number of columns *)
> newListA =
>   ArrayFlatten[{PadRight[#, {mostRows, numColumns}, Null] & /@
> listA}];
> Export["C:\\Documents and Settings\\Sjoerd\\Desktop\\New Text \
> Document.tsv", newListA, "TSV"]
> 
> (The "TSV" part is superfluous if the filename already has this as
> extension)
> 
> Cheers -- Sjoerd
> 
> 
> On Jun 29, 2:27 pm, hemke <h.mae... at gmail.com> wrote:
>> Hi,
>>
>> I am trying to export some data I imported and then manipulated with
>> mathematica. I have a List of several Tables, i.e.
>>
>> ListA={TableA, TableB, TableC, ...}
>>
>> A typical Table looks like this:
>>
>> TableA={{1,2},{4,5},...}.
>>
>> The Tables in ListA all have the same number of columns but differing
>> number of rows.  Now, I want to export these Tables into one tabulator
>> separated file with the same structure, i.e. line N in the output file
>> should contain the elements in row N of each Table, or in other words I
>> want the following:
>>
>> TableA[[1,1]]   TableA[[1,2]]   TableB[[1,1]]   TableB[[1,2]]   .=
> ..
>> TableA[[2,1]]   TableA[[2,2]]   TableB[[2,1]]   TableB[[2,2]]   .=
> ..
>> ...             ...             ...       =
>       ...
>> TableA[[M-1,1]] TableA[[M-1,2]] TableB[[P,1]]   TableB[[P,2]]   ...
>> TableA[[M,1]]   TableA[[M,2]]                     =
>               ...
>> Here I chose (as an example), Length[TableA]=M and Length[TableB]=P w=
> ith
>> M>P.
>>
>> I tried it with Export["myfile.dat", ListA] but it does not produce the
>> desired output, instead it yields:
>>
>> {TableA[[1,1]],TableA[[1,2]]}   {TableA[[2,1]],TableA[[2,2]]}   ...
>> {TableB[[1,1]],TableB[[1,2]]}   {TableB[[2,1]],TableB[[2,2]]}   ...
>> ...                             ...
>>
>> (In the above, TableX[[i,j]] represents a number in the corresponding
>> element of a table, and not the text "TableX[[i,j]]"... ;) )
>>
>> Ok, I hope I explained the problem sufficiently. Probably there is a
>> simple solution but I just don't see it.
>>
>> Please help! Thanks!
>>
>> Hemke
> 
> 


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