Galois field array generation...issues!

2013 4 20
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for the given code:
primpoly = 1 0 1 1
m = 4( assumed)
indx = [0:1:2.^m-1]; %power index
for r = 1:length(indx)
U = gftuple(indx,primpoly,p)
end
I want U to be listed out in a p.^m-1 by m+1 array and not separately. so that i can access each row of U for further computation. but with the above i get U separately for each loop run and the previous U is over-written.
Also, Can i code it without using gftuple, like without any built-in function?

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Walter Roberson
Walter Roberson 2013-4-20

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U(r,:) = gftuple(indx,primpoly,p);

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Malik
Malik 2013-4-20
编辑：Malik 2013-4-20
this generates only one U at the end several times. I want all possible U's generated by the loop to be saved up in ONE matrix/table. the o/p here is:
U =
1 0 1
1 0 1
1 0 1
1 0 1
1 0 1
1 0 1
1 0 1
1 0 1
several times! which is not the desired output.
Malik
Malik 2013-4-20
yes this gives the right output but several times if i do not put ';' this means U is being produced several times, cant it be reduced to just once....n Thanks!
Walter Roberson
Walter Roberson 2013-4-20
Sorry, I do not have the Communications Toolbox to test with.
Are all of the output U's exactly the same? When there is an assignment to part of an array and you do not have a semi-colon, MATLAB outputs the entire array.
Malik
Malik 2013-4-20
the output U is as follows:
U =
1 0 0
0 1 0
0 0 1
1 0 1
1 1 1
1 1 0
0 1 1
1 0 0
But my objective was to call this U once but here this U gets repeated 8 times (the exact same U, dont know why).
Walter Roberson
Walter Roberson 2013-4-20
Is your code line literally
primpoly = 1 0 1 1
instead of
primpoly = [1 0 1 1]
??
Walter Roberson
Walter Roberson 2013-4-20
I do not know why the output would be exactly the same each time when indx(r) is used, but I do see in the documentation that you do not need the loop.
U = gftuple( indx(:), primpoly, p )
Notice passing in a column of indices instead of the row you were using.
Malik
Malik 2013-4-20
well U = gftuple( indx(:), primpoly, p ) actually works! Thanks! and yes it is supposed to be [1 0 1 1].
Malik
Malik 2013-4-20
Is there some way to code this gf tuple function without using the built-in function?
Walter Roberson
Walter Roberson 2013-4-20
Probably, but I have not researched to find out what the expected output would be.

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