MATLAB: How to compare pair of rows in a column and report it in hexadecimal format

comparehexadecimalmatrixrows

Hello,

I have a 512×1 matrix (512 rows and 1 column)

The value of ROW1 should be compared with ROW2, similarly ROW3 with ROW4, etc. I have to compute this 256-bit response and report it in hexadecimal format assuming; if ROW1 > ROW2 then 1 & if ROW2 > ROW1 then 0

In this way I will get 256×1 from this.

Please advise!

Best Answer

data = rand(512,1);
oddrows = data(1:2:end);
evenrows = data(2:2:end);
response1 = oddrows > evenrows;
response2 = evenrows > oddrows;
response1 = char(response1' + '0');
response2 = char(response2' + '0');
% download bin2hex function from matlab file exchange
% https://www.mathworks.com/matlabcentral/fileexchange/1975-bin2hex
response1hex = bin2hex(response1);
response2hex = bin2hex(response2);

Related Solutions

MATLAB: How to compare pair of rows in a column and report it in hexadecimal format

Try this:

x=reshape(mymatrix,2,[])';
y=num2str(x(:,1)>x(:,2))';
y=dec2hex(bin2dec(reshape(y(y~=' '),8,[])'))';
hexRep=y(:)';

MATLAB: How to access hex values stored in a char in matlab

The output types of DataHash are: hex, HEX, double, uint8, base64. You could specify the wanted output type at calling DataHash. hex (hexadecimal number as char vector and lowercase characters) is the default. hex, HEX and base64 reply char vectors. Hexadecimal values are represented as char vectors in general. Therefore your question is not clear. Please post the char vector you have and an example of what you want to get.

If your string is like: '5b302b7b2099a97ba2a276640a192485', sscanf is faster than hex2dec or hex2num:

num = sscanf(S, '%2x', [1, Inf])

If your string is like: '+tJN9yeF89h3jOFNN55XLg'

function Out = base64toHex(In)
P  = [65:90, 97:122, 48:57, 43, 47] + 1;  % [0:9, a:z, A:Z, +, /]
v8 = [128, 64, 32, 16, 8, 4, 2, 1];
v6 = [32; 16; 8; 4; 2; 1];
Table    = zeros(1, 256);
Table(P) = 1:64;
Data     = Table(In(:).' + 1) - 1;
X        = rem(floor(bsxfun(@rdivide, Data, v6)), 2);
Num      = v8 * reshape(X(1:fix(numel(X) / 8) * 8), 8, []);
Out = sprintf('%.2x', Num);
end

This is a simplified version of a base64 decoder only: It does not consider linebreaks and padding characters. Use it for the output of DataHash only.

If you want DataHash to reply the byte values, use:

Opt.Format = 'double';  % Or 'uint8': same values, different type

Best Answer

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MATLAB: How to compare pair of rows in a column and report it in hexadecimal format

MATLAB: How to access hex values stored in a char in matlab

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