Avoid autoscaling of wordlength and fractionlength in fixed point objects

2 次查看（过去 30 天）
Italo
Italo 2012-11-30
回答： MathWorks Fixed Point Team 2025-7-24
Hello, I set a fixed point object with wordlength 16 and fractionlength 4
x=ufi(16,12,4)
but when I make an operation on the object, the wordlength and fractionlength get changed, for example
y = sqrt(x)
scales those to 6 and 2 respectively.
How can I avoid this autoscaling?
Thanks!

请先登录，再回答此问题。

回答（1 个）

MathWorks Fixed Point Team
SQRT function computes the square root of a fi object using a bisection algorithm.
You can use additional numerictype to control the output data types:
c = sqrt(a,T) returns the square root of fi object a with numerictype object T. Intermediate quantities are calculated using the fimath associated with a. See Data Type Propagation Rules.
x=ufi(16,12,4)
T = numerictype(0, 12, 4)
y = sqrt(x,T);
The choice of output data type without specifying T is documented as "internal rule" section of the function reference.

类别

在 Help Center 和 File Exchange 中查找有关 Multirate Signal Processing 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by