Hex to Num / Hex Cell Array

Hello I have a hex cell array and I indexed them.

For example I have 'A7' and when I use hex2dec, it gives me nonsense result which is -7.7452e-121. how can I get exact result? I mean I want to see that hex A7 = decimal 167.

Thank you.

[Chunru]

Can you show your cell array?

[Rik]

Please post code that reproduces this issue. You can run code within the editor to make sure the effect matches what you see in your local copy.

[tinkyminky93]

My cell array is like

4x1 cell array

{'3A'} {'F1'} {'CF'} {'4C'}

[tinkyminky93]

I can not post it there because I am reading these values from data log.

[Stephen23]

hex2dec('A7') % what you should have used

ans = 167

hex2num('A7') % what you actually used

ans = -7.7452e-121

The unfortunately named NUM2HEX and HEX2NUM convert to/from the IEEE 754 floating point hexadecimal representation, they are completely unsuitable for your task. Just for interest, the complete hexadecimal is:

num2hex(hex2num('A7'))

ans = 'a700000000000000'

Apparently someone thought that it would be a good idea to pad its input with trailing zeros. Ugh.

[Chunru]

hex2num inteprete 'A7' as IEEE double number (64bit) with mantissa and exponents. So padding 0's before 'A7'. The string is in a different order (from last byte to first byte) so it looks like (actually not) padding 0's after 'A7'.

Answer 1

[Chunru]

x ={'3A', 'F1', 'CF', '4C'}

x = 1×4 cell array
    {'3A'}    {'F1'}    {'CF'}    {'4C'}

y = cellfun(@hex2dec, x)

y = 1×4

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