convert fixed point to real data
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Hi, I use the command sfi to convert real values into fixed point representation. Specifically, I use this:
F=sfi(my_value, 32, 16);
A=F.hex;
Now, I need to do the opposite. Convert the fixed point to real value. Any ideas? Is there a command for that?
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Answers (4)
Massimo Zanetti
on 15 Mar 2017
Does this help you?
%get sfi
a = sfi(pi);
%convert to double
d = double(a)
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Massimo Zanetti
on 15 Mar 2017
Edited: Massimo Zanetti
on 15 Mar 2017
Forget about the double method. Actually, the fi objects have a method to get the real world value:
a = sfi(pi)
%real world value
a.data
ans =
3.1416
If you are not dealing with fi objects and your task is to convert a hex number to decimal, then you would use hex2dec Matlab function.
Note: The hex property does not represent the conversion of your real world value to hex base, here is an example:
%store 5 as signed fixed-point with 8bit word and best fraction
a = sfi(5,8);
a.data
5
a.bin
01010000
a.int
80
a.hex
50
As you can see, the numeric values you get are obtained by converting the binary representation of the fixed point number into int, hex, etc.
John D'Errico
on 15 Mar 2017
Edited: John D'Errico
on 15 Mar 2017
In general, whenever you want to convert a numeric value in some other class into a double precision number, you use the function double. This is said without even looking to see if double is defined for that toolbox (I don't have that TB.) I am sure that it is, but I'll check online. Checked.
Use double. Just remember: If you want to make it a double, then double will do it. Similarly, single will convert to a single precision number.
For those who might misinterpret my comment to think that double('1234') should also do that conversion, it is the one case I can think of where you need a different tool. There, you would use str2double.
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Erik Aderstedt
on 16 Mar 2018
Use storedInteger:
F=sfi(my_value, 32, 16);
value = storedInteger(F);
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