Floating Point Math
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Ennis Ray Lynch, Jr. wrote:
Most of my work four places is good enough and I wrote a hurricane damage simulator.
Well, how much precision do you need to say $15 billion (or whatever the number is in billions of dollar?) Marc
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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
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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 – ∞)
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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 – ∞)
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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 – ∞)
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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 – ∞)
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no, BYTEs. doubles are 8 bytes each. 3x8 = 24 bytes.
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Query for all the naysayers ... which would you rather have fast floating point operations or 15 places of accurate precision? Most of my work four places is good enough and I wrote a hurricane damage simulator.
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
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
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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
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Someone, somewhere, is thinking "I am a hurricane damage simulator".
cheers Chris Maunder
Sean been at the hamsters' sunflower hooch again?
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Query for all the naysayers ... which would you rather have fast floating point operations or 15 places of accurate precision? Most of my work four places is good enough and I wrote a hurricane damage simulator.
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
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();
}
} -
Mine isn't nearly as accurate. Wind fields in real-life are surprisingly non-deterministic and literally change with the phase of the moon.
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
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();
}
} -
Query for all the naysayers ... which would you rather have fast floating point operations or 15 places of accurate precision? Most of my work four places is good enough and I wrote a hurricane damage simulator.
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
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Query for all the naysayers ... which would you rather have fast floating point operations or 15 places of accurate precision? Most of my work four places is good enough and I wrote a hurricane damage simulator.
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
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)
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Query for all the naysayers ... which would you rather have fast floating point operations or 15 places of accurate precision? Most of my work four places is good enough and I wrote a hurricane damage simulator.
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
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.
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Query for all the naysayers ... which would you rather have fast floating point operations or 15 places of accurate precision? Most of my work four places is good enough and I wrote a hurricane damage simulator.
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
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
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Mine isn't nearly as accurate. Wind fields in real-life are surprisingly non-deterministic and literally change with the phase of the moon.
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
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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();
}
} -
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();
}
} -
Query for all the naysayers ... which would you rather have fast floating point operations or 15 places of accurate precision? Most of my work four places is good enough and I wrote a hurricane damage simulator.
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
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.
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Query for all the naysayers ... which would you rather have fast floating point operations or 15 places of accurate precision? Most of my work four places is good enough and I wrote a hurricane damage simulator.
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
I would rather use strings, and convert to accurate precision using Unidex.
