double2fixedpoint

Convert double data-taype to fixed-point data-type
The double2fixedpoint function is developed to convert double or float numbers to fixed-point representation.
The function output is a struct data-type The input to the function can be struct or double/float number.
The function operates in single values. A wrapper is required for arrays.
The function output is 2's complement for signed numbers.
The output is in struct format and has the following fields:
'S', Sign digit
'WL', Word-length
'FL', Fraction-length
'int', Integer representation of fixed-point number
'bin', Binary representation of fixed-point number
'sgn', Sign bit
'dec', Decimal part of fixed-point number (LHS of decimal point)
'frac', Fraction part of fixed-point (RHS of decimal point)
'fxp', Fixed-point number (quantized)
'float', Float/Double representation of number (copy of input)
'max', Maximum (uppoer bound) of fixed-point number based
on specified range by (S/WL/FL) positive number
'min', Maximum (uppoer bound) of fixed-point number based
on specified range by (S/WL/FL) negative number for
signed and zero for unsigned
'DR_dB', Dynamic range based on specified range by
(S/WL/FL) equivelent to ratio between Maximum
and 1
'res', Resolution based on specified range by (S/WL/FL)
determined by reciprocal of 2^FL
'of_flag', Flag indicating that overflow has been occured
The usage is as follow:
x_fxp = double2fixedpoint(x, S, WL, FL, OF)
It is developed and tested on Octave 5.2.0