hex

Description

hex(a) returns the stored integer of fi object a in hexadecimal format as a string. hex(a) is equivalent to a.hex.

Fixed-point numbers can be represented as

or, equivalently as

The stored integer is the raw binary number, in which the binary point is assumed to be at the far right of the word.

Examples

Viewing fi Objects in Hexadecimal Format

The following code

a = fi([-1 1],1,8,7);
y = hex(a)
z = a.hex

returns

y =

		80   7f

z =

		80   7f

Writing Hex Data to a File

The following example shows how to write hex data from the MATLAB^® workspace into a text file.

First, 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 

MATLAB returns:

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

Reading Hex Data from a File

The following example shows how to read hex data from a text file back into the MATLAB workspace.

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

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 =
         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