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Tag Archives: double
Exceptional Floating Point
Floatingpoint math has an answer for everything, but sometimes that’s not what you want. Sometimes instead of getting an answer to the question sqrt(1.0) (it’s NaN) it’s better to know that your software is asking imaginary questions. The IEEE standard … Continue reading
Posted in AltDevBlogADay, Floating Point, Programming
Tagged divide by zero, double, exceptions, float, floating point
30 Comments
Intermediate FloatingPoint Precision
Riddle me this Batman: how much precision are these calculations evaluated at? If you answered ‘double’ and ‘float’ then you score one point for youthful idealism, but zero points for correctness. The correct answer, for zeroidealism points and forty two … Continue reading
Float Precision–From Zero to 100+ Digits
How much precision does a float have? It depends on the float, and it depends on what you mean by precision. Typical reasonable answers range from 69 decimal digits, but it turns out that you can make a case for … Continue reading
Posted in AltDevBlogADay, Floating Point, Programming
Tagged double, float, floating point, floating point precision, precision, significant figures
52 Comments
Comparing Floating Point Numbers, 2012 Edition
This post is a more carefully thought out and peer reviewed version of a floatingpoint comparison article I wrote many years ago. This one gives solid advice and some surprising observations about the tricky subject of comparing floatingpoint numbers. A … Continue reading
Posted in AltDevBlogADay, Floating Point, Programming
Tagged comparing floats, double, epsilon, float, floating point precision, floating point tricks, precision
234 Comments
Don’t Store That in a Float
I promised in my last post to show an example of the importance of knowing how much precision a float has at a particular value. Here goes. As a general rule this type of data should never be stored in … Continue reading
Posted in AltDevBlogADay, Floating Point, Programming
Tagged double, float, floating point, game time, microseconds, precision, time resolution
27 Comments