decimal to hexadecimal with fixed point

I have the following code: that turns a string hexadecimal value into a numbers like [-0.12 -0.34 0.67 0.54 -0.128 0.256 ...]:

f_aux0 = fi(1,0,8,0);     

% Read first value
t_dat0 = fgetl(fid0);
t_dat1 = fgetl(fid1);

% Get data arrays
while (i < l)
    f_aux0.hex = t_dat0;

        ADC(i) = (f_aux0.data - 2^7)/2^7;

(...)

that turns a string hexadecimal value into a numbers like [-0.12 -0.34 0.67 0.54 -0.128 0.256 ...].

I want to do the inverse, this means, to convert a number like [-0.12 -0.34 0.67(...) in hexadecimal with the same " fi "

I also tried something like this:

adc=adc + (adc<0).*2^7; 
hexstring=dec2hex(adc, ceil(7/4));

But gave me an error, in some cases the values were negative...

If some one can help me.

Answer 1

[Jessica Clayton]

I understand that you are trying to convert between decimal and hex notation for fixed point values. This answer provides several different methods of accomplishing this task.