Fixed-Point Blockset

float

Create a MATLAB structure describing a floating-point data type

Syntax

• a = float('single')
  a = float('double')
  a = float(TotalBits, ExpBits)
  

Description

float('single') returns a MATLAB structure that describes the data type of an IEEE single (32 total bits, 8 exponent bits).

float('double') returns a MATLAB structure that describes the data type of an IEEE double (64 total bits, 11 exponent bits).

float(TotalBits, ExpBits) returns a MATLAB structure that describes a nonstandard floating-point data type that mimics the IEEE style. That is, the numbers are normalized with a hidden leading one for all exponents except the smallest possible exponent. However, the largest possible exponent might not be treated as a flag for Infs and NaNs.

float is automatically called when a floating-point number is specified in a block dialog box.

Note    Unlike fixed-point numbers, floating-point numbers are not subject to any specified scaling.

Example

Define a nonstandard, IEEE-style, floating-point data type with 31 total bits (excluding the hidden leading one) and 9 exponent bits:

• a = float(31,9)
  a = 
         Class: 'FLOAT'
      MantBits: 21
       ExpBits: 9
  

See Also

sfix, sfrac, sint, ufix, ufrac, uint

fixpt_set_all

fpupdate