Create a signed fi object with values -1 and 1, a word length of 8 bits, and a fraction length of 7 bits.

a = fi([-1 1], 1, 8, 7)

a=1×2 object
   -1.0000    0.9922

          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Signed
            WordLength: 8
        FractionLength: 7

Find the hexadecimal representation of the stored integers of fi object a.

b = hex(a)

b = 
'80   7f'

This example shows how to write hexadecimal data from the MATLAB workspace into a text file.

Define your data and create a writable text file called hexdata.txt.

x = (0:15)'/16;
a = fi(x, 0, 16, 16);
h = fopen('hexdata.txt', 'w');

Use the fprintf function to write your data to the hexdata.txt file.

for k = 1:length(a)
    fprintf(h, '%s\n', hex(a(k)));
end

fclose(h);

To see the contents of the file you created, use the type function.

type hexdata.txt

0000
1000
2000
3000
4000
5000
6000
7000
8000
9000
a000
b000
c000
d000
e000
f000

This example shows how to read hexadecimal data from a text file back into the MATLAB workspace.

Define your data, create a writable text file called hexdata.txt, and write your data to the hexdata.txt file.

x = (0:15)'/16;
a = fi(x, 0, 16, 16);
h = fopen('hexdata.txt', 'w');

for k = 1:length(a)
    fprintf(h, '%s\n', hex(a(k)));
end

fclose(h);

Open hexdata.txt for reading and read its contents into a workspace variable

h = fopen('hexdata.txt', 'r');

nextline = '';
str = '';

while ischar(nextline)
    nextline = fgetl(h);
    if ischar(nextline)
        str = [str; nextline];
    end
end

fclose(h);

Create a fi object with the correct scaling and assign it the hex values stored in the str variable.

b = fi([], 0, 16, 16);
b.hex = str

b=16×1 object
         0
    0.0625
    0.1250
    0.1875
    0.2500
    0.3125
    0.3750
    0.4375
    0.5000
    0.5625
    0.6250
    0.6875
    0.7500
    0.8125
    0.8750
    0.9375

          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Unsigned
            WordLength: 16
        FractionLength: 16