dec2bin ast n=25

Question

Quynh tran 2017-6-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/344636-dec2bin-ast-n-25

评论： Quynh tran 2017-6-14

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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Answer 1

Walter Roberson 2017-6-14

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https://ww2.mathworks.cn/matlabcentral/answers/344636-dec2bin-ast-n-25#answer_270648

在 MATLAB Online 中打开

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