Creating a hex array with 4 digit blocks from an array of integers

Question

Art 2017-1-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321382-creating-a-hex-array-with-4-digit-blocks-from-an-array-of-integers

评论： Walter Roberson 2017-1-22

I am using R2013 and need to convert a large decimal array into hex stings.

The decimal numbers can be any positive integer, and I need to convert each number, then display each as a minimum two byte string with preceding zeros (with more bytes shown as the number increases).

e.g. decimal "1" should show up as '0x0001',

decimal "69876" should show up as '0x0001 0x10F4'

I created a rather cumbersome loop that does this perfectly, but with large arrays it takes too long.

I can get part way to a non-loop implementation with this code:

DecArray = [1 2 4 69876];
cellstr(dec2hex(reshape(DecArray,[],1), 4));
ans = 
    '00001'
    '00002'
    '00004'
    '110F4'

But as you see the outputs

1) always have the same number of digits, and

2) aren't broken into 2 Byte blocks

Is there any way to go from these results to the ones I described earlier without another loop?

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Art 2017-1-22

编辑：Art 2017-1-22

The data can be in 16bit OR 32bit words, so it's just a matter of displaying in the easiest way to read for the data being analyzed. If the dec number is greater than 65535 then it's a 32 bit and should display as such.

Walter Roberson 2017-1-22

I dunno. It just seems unlikely to me that the data could vary between 16 and 32 bits on the same plot.

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Answer 1

Stephen23 2017-1-21

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https://ww2.mathworks.cn/matlabcentral/answers/321382-creating-a-hex-array-with-4-digit-blocks-from-an-array-of-integers#answer_251431

编辑：Stephen23 2017-1-21

在 MATLAB Online 中打开

V = [1,2,4,69876];
L = log(16);
for k = 1:numel(V)
    N = 4*(1+fix(log(V(k))/L/4));
    S = sprintf('%0*X',N,V(k));
    Z = sprintf('0x%c%c%c%c ',S)
end

Prints this in the command window:

Z =
0x0001 
Z =
0x0002 
Z =
0x0004 
Z =
0x0001 0x10F4

Note: does not work for zero: add N = max(4,N)

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Art 2017-1-21

Stephen,

This works great and is much simpler than my old loop. If I can't get Guillaume's answer to work then I will accept this. Thanks!

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Answer 2

Guillaume 2017-1-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321382-creating-a-hex-array-with-4-digit-blocks-from-an-array-of-integers#answer_251433

在 MATLAB Online 中打开

DecArray = [1 2 4 69876]';
h = arrayfun(@dec2hex, DecArray, 'UniformOutput', false);
cellfun(@(s) strcat('0x', cellstr(reshape([repmat('0', 1, mod(-numel(c), 4)), c], 4, [])')), d, 'UniformOutput', false)