Floating Point Math

[Lost User]

Instead of running before a speeding object, I'd recommend stepping aside. Go West.

Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^]

[Ennis Ray Lynch Jr]

You are not supposed to point out flaws in my argument!

Need custom software developed? I do custom programming based primarily on MS tools with an emphasis on C# development and consulting. "And they, since they Were not the one dead, turned to their affairs" -- Robert Frost "All users always want Excel" --Ennis Lynch

[OriginalGriff]

Depends how fast I can move, and the size and initial distance to the storm. Going west means I need to move faster than running directly away.

Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952) Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)

[Lost User]

OriginalGriff wrote:

Depends how fast I can move, and the size and initial distance to the storm.

Size! ..that's the thing I did not take into account. Ah, just a small bug :laugh:

Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^]

[OriginalGriff]

There's always something, isn't there? :laugh:

Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952) Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)

[Lost User]

Not always, but very often :rolleyes:

[enhzflep]

Chris Losinger wrote:

but need to convert the input to doubles for the internals

:doh: Of course. Must be about time for bed for me... Those images sure do get pretty big, pretty quick, at that rate of memory consumption.

[Dr Walt Fair PE]

I work on stuff where 15 digits is marginally OK, using plenty of trickery.

CQ de W5ALT

Walt Fair, Jr., P. E. Comport Computing Specializing in Technical Engineering Software

[Mycroft Holmes]

Eddy Vluggen wrote:

Size!

It does matter apparently!

Eddy Vluggen wrote:

Ah, just a small bug

That's what she said.

Never underestimate the power of human stupidity RAH

[Nagy Vilmos]

Sean been at the hamsters' sunflower hooch again?

[Sander Rossel]

I'll have my math float away, thank you! :D

It's an OO world.

public class SanderRossel : Lazy<Person>
{
public void DoWork()
{
throw new NotSupportedException();
}
}

[Sander Rossel]

Ennis Ray Lynch, Jr. wrote:

and literally change with the phase of the moon.

So do I! Oh no... It's a full moo OOOOOOOOOOH!!! *Howl*

It's an OO world.

public class SanderRossel : Lazy<Person>
{
public void DoWork()
{
throw new NotSupportedException();
}
}

[greldak]

Depends what I need to do - for some things I don't need either, others will need precision and also accuracy in which case there's no point getting the wrong answer instantly, others I just need an estimate but I need it quickly

[Stefan_Lang]

Most of my work, 4 byte floats are too inaccurate. Some of my work, doubles barely suffice. All of my work, speed matters. Conclusion: I need both, and I need it yesterday! ;P

GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)

[Duncan Edwards Jones]

Sometimes you can solve/reduce floating point problems by scaling up - always recording your prices in pennies not dollars for example and your hurricane strength in metric butterflies.

[Dan Neely]

4 base 10 digits would generally be OK if the internal representation was base 10 also. Even with all the digits an IEEE754 64bit float provides, weirdness from the inability to represent 0.1 precisely in binary has an obnoxious habit of leaking into userspace.

Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason? Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful? --Zachris Topelius Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies. -- Sarah Hoyt

[J Julian]

But phases of the moon are VERY deterministic.

[J Julian]

A were-cow????

[J Julian]

Is that anything like a root beer float?

[patbob]

Both. In my experience, when I've needed more than just a few digits of precision, its because I'm doing a complex calculation, and that's usually when I've needed both precision and speed.

We can program with only 1's, but if all you've got are zeros, you've got nothing.