sfrac - Create MATLAB structure describing signed fractional data type
Syntax
a = sfrac(TotalBits)
a = sfrac(TotalBits, GuardBits)
Description
sfrac(TotalBits) returns a MATLAB structure that describes the
data type of a signed fractional number with a word size given by TotalBits.
sfrac(TotalBits, GuardBits) returns a MATLAB structure that describes the
data type of a signed fractional number. The total word size is given
by TotalBits with GuardBits bits
located to the left of the binary point.
sfrac is automatically called when a signed
fractional data type is specified in a block dialog box.
The most significant (leftmost) bit is the sign bit. The default
binary point for this data type is assumed to lie immediately to the
right of the sign bit. If guard bits are specified, they lie to the
left of the binary point and to right of the sign bit. For example,
the structure for an 8–bit signed fractional data type with
4 guard bits is:
Examples
Define an 8-bit signed fractional data type with 4 guard bits.
Note that the range of this number is -24 =
-16 to (1 - 2(1 - 8)).24 =
15.875:
a = sfrac(8,4)
a =
Class: 'FRAC'
IsSigned: 1
MantBits: 8
GuardBits: 4
See Also
fixdt, float, sfix, sint, ufix, ufrac, uint
 | sfix | | signalbuilder |  |
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