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dec2bin ast n=25

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Quynh tran
Quynh tran el 13 de Jun. de 2017
Comentada: Quynh tran el 14 de Jun. de 2017
Dear all, I want to create a matrix including number 0 and 1. but only 10 number 1 in a row. for example:
A=[1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1
0 0 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
......]
|but with command dec2bin, the limitation is only to n=20 because if n=25, it's over the memory of computer with this inform "Requested 1073741823x1 (8.0GB) array exceeds maximum array size preference. Creation of arrays greater than this limit may take a long time and cause MATLAB to become unresponsive. See array size limit or preference panel for more information". | Could we have another way to make this matrix. Thanks

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Walter Roberson
Walter Roberson el 14 de Jun. de 2017
N = 20;
chunksize = 2^10; %must divide 2^N
ten1s = [];
for K = 0 : chunksize : 2^N - 1
this_chunk = K : K + chunksize - 1;
these_bits = dec2bin(this_chunk, N);
mask = sum(these_bits == '1', 2) == 10;
ten1s = [ten1s; uint8(these_bits(mask,:) - '0')];
end
  1 comentario
Quynh tran
Quynh tran el 14 de Jun. de 2017
you are amazing. thank you so much <3

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