The Full Wiki

More info on Truncation

Truncation: Wikis

Advertisements
  
  

Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.

Encyclopedia

From Wikipedia, the free encyclopedia

In mathematics and computer science, truncation is the term for limiting the number of digits right of the decimal point, by discarding the least significant ones.

For example, consider the real numbers

5.6341432543653654
32.438191288
−6.3444444444444

To truncate these numbers to 4 decimal digits, we only consider the 4 digits to the right of the decimal point.

The result would be:

5.6341
32.4381
−6.3444

Note that in some cases, truncating would yield the same result as rounding, but truncation does not round up or round down the digits; it merely cuts off at the specified digit. The truncation error can be twice the maximum error in rounding.

Truncation and floor function

Truncation of positive real numbers can be done using the floor function. Given a number x \in \mathbb{R}_+ to be truncated and n \in \mathbb{N}_0, the number of elements to be kept behind the decimal point, the truncated value of x is

\mbox{trunc} \left(x,n \right) = \frac{\lfloor INT(10^n \cdot x )\rfloor}{10^n}.

However, for negative numbers truncation does not round in the same direction as the floor function: truncation always rounds toward zero, the floor function rounds towards negative infinity.

See also

External links


Advertisements






Got something to say? Make a comment.
Your name
Your email address
Message