Changes between Version 80 and Version 81 of DatabaseBasedAnalysis

Timestamp:

08/06/18 16:57:06 (6 years ago)

Author:

tbretz

Comment:

--

DatabaseBasedAnalysis

@@ -778 +778 @@
 A very interesting read is https://dev.mysql.com/doc/refman/5.7/en/precision-math.html (and its sub-sections! Click on ''NEXT'').
 
-In short: A value like 1.234 is an ''exact'' value and exact math calculation are performed. If a value is given as an approximate ''floating-point'' value (which all '''DOUBLE''' columns are), for example 1.234e0, the calculation is ''not exact''. ''Not exact'' means that it using (faster) ''floating-point'' arithmetic rather than (slower) ''exact'' arithmetic.
+In short: A value like 1.234 is an ''exact'' value and exact arithmetic calculations are performed utilizing a dedicated library. If a value is given as an approximate ''floating-point'' value (which all '''DOUBLE''' columns are), for example 1.234e0, the calculation is ''not exact''. ''Not exact'' means that it using (faster) ''floating-point'' arithmetic rather than (slower) ''exact'' arithmetic.
 
 Now, any mathematical operation which at least contains one ''floating-point'' number is evaluated as a floating-point approximation. This sounds very simple and as if it has nothing to do with our analysis, but it has: