double

Double-precision floating-point real-world value of fi object

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Syntax

b = double(a)

Description

b = double(a) returns the real-world value of a fi object in double-precision floating point format.

Fixed-point numbers can be represented as

$r e a l - w o r l d v a l u e = 2^{- f r a c t i o n l e n g t h} \times s t o r e d i n t e g e r$

or, equivalently as

$r e a l - w o r l d v a l u e = (s l o p e \times s t o r e d i n t e g e r) + b i a s$

example

Examples

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View Stored Integer of `fi` Object in Double-Precision Format

Open Live Script

Create a signed fi object with values -1 and 1, a word length of 8 bits, and a fraction length of 7 bits.

a = fi([-1 1], 1, 8, 7)

a = 
   -1.0000    0.9922

          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Signed
            WordLength: 8
        FractionLength: 7

Find the double-precision floating-point real-world value of the stored integers of fi object a.

b = double(a)

b = 1×2

   -1.0000    0.9922

Input Arguments

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`a` — `fi` object to view in double-precision floating-point
`fi` object

Input fi object to view in double-precision floating-point.

Data Types: fi

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Usage notes and limitations:

For the automated workflow, do not use explicit double or single casts in your MATLAB^® algorithm to insulate functions that do not support fixed-point data types. The automated conversion tool does not support these casts. Instead of using casts, supply a replacement function. For more information, see Function Replacements.

Version History

Introduced before R2006a