Create a signed fi variable with a 16-bit word length and zero fraction length. This is equivalent to an int16 data type. Cast the variable to the equivalent MATLAB data type using the castFiToMATLAB function.

u = fi(25,1,16,0);
y1 = castFiToMATLAB(u)

y1 =

  int16

   25

When the input is a fi object with a non-zero fraction length, the function returns the original fi object because the input cannot be represented by a built-in data type.

u = fi(pi,1,64,32);
y2 = castFiToMATLAB(u)

y2 = 

    3.1416

          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Signed
            WordLength: 64
        FractionLength: 32

When the input is a double-precision fi object, the function returns a double with the same value.

T = numerictype('Double');
u = fi(25,T)

u = 

    25

          DataTypeMode: Double

y3 = castFiToMATLAB(u)
class(y3)

y3 =

    25

ans =

    'double'