The fixed-point properties WordLength and FractionLength are part of a fixed-point number's datatype. Fixed-point numbers with different FractionLength/WordLength are considered different data types.
In MATLAB, an array can be used to store multiple elements of the same datatype. Therefore an array cannot be used to store fixed-point numbers of different WordLength/FractionLength because their data types are different.
Alternatively, a cell array can be used to store fixed-point number with different WordLength/FractionLength.
For instance,
>> wi = {16 2 3 13; 5 11 10 8; 9 7 6 12; 4 14 15 1};
>> fiOut = cellfun(@fi,wi,'UniformOutput',false);
It is not possible to apply 'fi' directly on the entire cell array. Thus you can use 'cellfun' to apply the function to each element of the cell array 'wi'.
