# Hex 01A9 to 16-binary?

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WARRIOR24 on 16 Dec 2020
Edited: Stephen on 17 Dec 2020
I am trying to convert this input 01A9 into binary
4bit Hex input
01A9
16bit Binary Output
0000 0001 1010 1001
**no spaces

Walter Roberson on 16 Dec 2020
H = '01A9';
dec2bin(sscanf(H, '%4x'),16)
ans = '0000000110101001'
Note that the result will be character.
H can have more than 4 characters, and will be interpreted 4 characters at a time from the beginning . So if H is not an exact multiple of 4 characters, this particular algorithm will not implicitly pad from the begining with 0's -- only the last group will be 0 padded.
dec2bin(sscanf('01A9876', '%4x'),16)
ans = 2x16 char array
'0000000110101001' '0000100001110110'
This was interpretered as 01A9 (0)876.
If you needed to be padded with leading 0s implicitly then that could certainly be programmed.

Stephen on 17 Dec 2020
Edited: Stephen on 17 Dec 2020
No loops, no padding, works correctly for any number of hex digits (not just 16 bits):
H = '01A9';
B = reshape(dec2bin(sscanf(H,'%1x'),4).',1,[])
B = '0000000110101001'

James Tursa on 16 Dec 2020
Edited: James Tursa on 16 Dec 2020
E.g., if H is not too big:
H = '01A9';
B = dec2bin(hex2dec(H),numel(H)*4)
Otherwise you will need some form of a loop (explicit or hidden in a function call). E.g.,
C = arrayfun(@(h)dec2bin(hex2dec(h),4),H,'uni',false);
B = [C{:}]

R2020a

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