HOW TO XOR NEGETIVE DECIMAL NUMBER?

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Al Anher Provat 2022-8-9

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https://ww2.mathworks.cn/matlabcentral/answers/1776765-how-to-xor-negetive-decimal-number

评论： Walter Roberson 2022-8-10

My original image size 256*256. I have performed transformation, then i divided the matrix into 4*4 block, then i performed decomposition on each block...output of decomposition was P ans S matrix...i shuffled the elements of p..but now i want to perform xor with s. but my problem is i need to xor a key with s matrix which contain negetive decimal number .. but it showing me error ..

for i=1:16
    bi=xor(Dec2bin(smod(i)),Dec2bin(finalkey(i)));
    s1(i)= Binary2Dec(bi);
end

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James Tursa 2022-8-9

编辑：James Tursa 2022-8-9

What are the variable types of smod and finalkey? Can you post a small subset of example data?

Al Anher Provat 2022-8-10

Smod contains positive+negative double and final key contains decimal number actually.

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回答（1 个）

Walter Roberson 2022-8-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1776765-how-to-xor-negetive-decimal-number#answer_1024075

编辑：Walter Roberson 2022-8-10

在 MATLAB Online 中打开

for i=1:16
    S = dec2bin(typecast(double(smod(i)), 'uint8'), 8) - '0');
    F = dec2bin(typecast(double(finalkey(i)), 'uint8'), 8) - '0'));
    bi = xor(S, F);
    s1(i) = typecast(uint8(bin2dec(char(bi + '0'))), 'double');
end