Convert fixed-point data types without changing underlying data
c = reinterpretcast(a, T)
c = reinterpretcast(a, T) converts the
input a to the data type specified by numerictype object T without
changing the underlying data. The result is returned in fi object c.
The input a must be a built-in integer or
a fi object with a fixed-point data type. T must
be a numerictype object with a fully specified
fixed-point data type. The word length of inputs a and T must
be the same.
The reinterpretcast function differs from
the MATLAB® typecast and cast functions
in that it only operates on fi objects and built-in
integers, and it does not allow the word length of the input to change.
In the following example, a is a signed fi object
with a word length of 8 bits and a fraction length of 7 bits. The reinterpretcast function
converts a into an unsigned fi object c with
a word length of 8 bits and a fraction length of 0 bits. The real-world
values of a and c are different,
but their binary representations are the same.
a = fi([-1 pi/4],1,8,7) T = numerictype(0,8,0); c = reinterpretcast(a,T)
a =
-1 0.7890625
numerictype(1,8,7)
c =
128 101
numerictype(0,8,0)To verify that the underlying data has not changed, compare
the binary representations of a and c:
binary_a = bin(a) binary_c = bin(c)
binary_a =
'10000000 01100101'
binary_c =
'10000000 01100101'cast | fi | numerictype | typecast