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 = -1.0000 0.7891 DataTypeMode: Fixed-point: binary point scaling Signedness: Signed WordLength: 8 FractionLength: 7 c = 128 101 DataTypeMode: Fixed-point: binary point scaling Signedness: Unsigned WordLength: 8 FractionLength: 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