How can a 4 element array index pull stored string values?

Hi all, I am new to MATLAB and I'm a bit stuck trying to figure out this part.

Let's say I have a 4 element vector [1x4 double] stored called "fourElementVector" (I have a function that changes these numbers a bit, situationally)

I also have a 256x1 cell "HexData" that stores a bunch of hexadecimal strings (ranging from 16bit to 128bit)

I'm trying to make the fourElementVector be the index and pull the values stored in HexData and store them as a string like:

[0B287 0B287 0B287 0B287] (just for an example. I don't want them converted)

The 4vector will always have a stored index numbers ranging from 1 - 256, and I have 256 hex codes, so it matches.

What do you think? How might I achieve this?

Answer 1

[Scott MacKenzie]

I think this is more or less what you are after. The output is generated both as a cell array and as a string vector.

% create random 16-bit hex values (as strings)
h = '0123456789abcdef'
idx = randi([1 16], 256, 4);
hexDataChar = h(idx);

% convert to 256x1 cell array of hex values 
hexData = cellstr(hexDataChar); 

% four element vector of indices
idx = randi([1 256], 1, 4);

% get four hex values from cell array
result1 = hexData(idx)
result2 = string(result1)

Output:

result1 =

4×1 cell array

{'b349'}

{'9cb2'}

{'cf42'}

{'1205'}

result2 =

4×1 string array

"b349"

"9cb2"

"cf42"

"1205"

[Akana Juliet]

Thank you so much!

Answer 2

[the cyclist]

Can you upload examples of your variables fourElementVector and HexData, in a MAT file? This would be helpful.

But it seems from your description that

HexData{fourElementVector}

might do what you intend?

[Akana Juliet]

Thank you so much! I think I got it. Next time I'll share a bit more though!