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Bug #534: factorial function

From: pgsql-bugs(at)postgresql(dot)org
To: pgsql-bugs(at)postgresql(dot)org
Subject: Bug #534: factorial function
Date: 2001-12-10 09:34:22
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Lists: pgsql-bugs
Janko Richter (j(dot)richter(at)wallstreet-develop(dot)de) reports a bug with a severity of 3
The lower the number the more severe it is.

Short Description
factorial function

Long Description
1. The factorial function returns 0 when the argument is 0. The factorial Funtion is defined as:  factorial(0)=1

2. It would be better to define a factorial function returning double precision. The factorial function returning bigint produces false values  with arguments larger then 20.

Notice: I'm using the factorial function for statistical functions (for example poisson distribution)

Thank you.

Sample Code
test=# select factorial(0);
(1 row)

janko=# select factorial(21::bigint);
(1 row)

No file was uploaded with this report


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