Insert hexadecimal values in array in MATLAB

Question

I am very new to matlab. I want to store hexadecimal values in array like this

P=[0x96,0x97,0x98];

But I surfed on google I got no solution for it So first I converted this hexadecimal into decimal so I got array like this

P=[150,151,152];

Now I am trying to get hexadecimal value of values of P array.

I tried

P=[dec2hex(150),dec2hex(151),dec2hex(152)];

But when I am trying to print P(1) then instead of 96 I got only 9. I am not understanding this part. How can I get correct result? Please help me.

Nick · Accepted Answer · 2015-01-26 09:35:24Z

4

Matlab stores hexadecimal number as character arrays (or strings).

So

a = dec2hex(150)

returns:

a = '96'

concatenating hexadecimal strings as you do:

P=[dec2hex(150),dec2hex(151),dec2hex(152)]

returns:

P = '969798'

Therefore, P(1) = '9'

You probably want to use cell arrays to separately store hex-numbers:

P = {dec2hex(150),dec2hex(151),dec2hex(152)};
P{1}

returns:

P = '96'

to retrieve the numeric value, use

hex2dec(P{1})

edited Jan 26, 2015 at 9:35

answered Jan 26, 2015 at 7:58

Nick

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1 Comment

YLG Over a year ago

But hex2num does not give same answer. Instead we can use str2num(P{1}) to retrive number

Nemesis · Accepted Answer · 2015-01-26 07:58:44Z

2

See manual for dec2hex

dec2hex - Convert decimal to hexadecimal number in string

You are getting a string and thus P(1) only gives you the first character of the string.

Try something like:

>> P=[dec2hex(150);dec2hex(151);dec2hex(152)]; % note the ; instead of ,
>> P

P =

96
97
98

>> P(1,:)

ans =

96

However, P is still an array of characters.

answered Jan 26, 2015 at 7:58

Nemesis

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Comments

Divakar · Accepted Answer · 2015-01-26 08:00:06Z

2

You can use arrayfun with dec2hex to work on them elementwise and produce a cell array as the output that uses the format 0x... -

P=[150,151,152] %// Input array
out = arrayfun(@(n) strcat('0x',dec2hex(P(n))),1:numel(P),'Uni',0)

Code run -

out = 
    '0x96'    '0x97'    '0x98'

answered Jan 26, 2015 at 8:00

Divakar

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