udecode

Convert quantized integer matrix elements to floating-point values.

Syntax

u = udecode(q, n)

u = udecode(q, n, v)

u = udecode(q, n, v, mode)

Inputs

q
The matrix to decode.
Type: integer
Dimension: matrix
n
The quantization exponent, specifying 2^n levels.
The valid range is [2,32]
Type: integer
Dimension: scalar
v
The upper limit of the interval to quantize, [-v,v). Values outside of this range are restricted to the nearest allowed value.
(default: 1)
Type: double
Dimension: scalar
mode
A flag to specify whether the overflow inputs saturate to the interval bounds or wrap around.
(default: 'unsigned')
Type: string

Outputs

u
The converted floating-point value for each element. The level values are the left endpoints of the intervals.

Example

Unsigned example: 
x = [-64,-49,-25,-16,-9,9,16,25,49,64];
q = udecode(x,6,60)

q = [Matrix] 1 x 10
0  5  18  23  27  36  40  45  58  63
Signed example: 
x = [-64,-49,-25,-16,-9,9,16,25,49,64];
q = uencode(x,6,60,'signed');
y = udecode(q,6,60)

y = [Matrix] 1 x 10
-60.00000  -50.62500  -26.25000  -16.87500  -9.37500  7.50000  15.00000  24.37500  48.75000  58.12500

Comments

If all(u) > 0 then the floating-point output is assumed to be nonnegative also.