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by Collector
November 24th, 2019, 8:31 pm
Forum: Numerical Methods Forum
Topic: Mathematica high precision question
Replies: 121
Views: 11325

Re: Mathematica high precision question

I suppose Collector's [$]f(x)[$] is given/known a priori? e.g.  some polynomial or combination of math functions?
yes indeed (just a money making formula)
by Collector
November 24th, 2019, 8:15 pm
Forum: Off Topic
Topic: Impending Ice Age - What We Can Do (Mitigation)
Replies: 1457
Views: 268551

Re: Impending Ice Age - What We Can Do (Mitigation)

Speaking as a former competitive XC skier, I find the entire perfluorochemicals ski wax story deeply disturbing. For those not into this kind of stuff, it turns out that parents of youth skiers in Norway are dying from exposure to PFCs because of their volunteer efforts to maximize the glide of the...
by Collector
November 24th, 2019, 5:07 pm
Forum: Numerical Methods Forum
Topic: Mathematica high precision question
Replies: 121
Views: 11325

Re: Mathematica high precision question

good good, yes now able to match what I got in excel. Had to use Weights -> (1/ww)^2 where ww is the observations (used in the NonlinearModelFit)
by Collector
November 24th, 2019, 2:23 pm
Forum: Numerical Methods Forum
Topic: Mathematica high precision question
Replies: 121
Views: 11325

Re: Mathematica high precision question

thanks, will look into some of these possibilities. My optimization criteria is simply to minimize  \(\sum_i^N |\frac{y_i-f(y_i)}{y_i}|\).  where \(y_i\) is the observations.  This I can do in a spread sheet or in C# for example, but did not find out how to do it in Mathemartica functions (at least ...
by Collector
November 23rd, 2019, 9:49 pm
Forum: Numerical Methods Forum
Topic: Mathematica high precision question
Replies: 121
Views: 11325

Re: Mathematica high precision question

I am working on some curve fitting.

I tried mathematica FindFit function and NonlinearModelFit. Seems like they use least square fitting, this gives worse fit than I did in a spread sheet. Is there a way to customize fit criteria in these functions mathematica?
by Collector
November 23rd, 2019, 5:45 am
Forum: Off Topic
Topic: News from Outer Space
Replies: 1191
Views: 135829

Re: News from Outer Space



How so?
intelligent ants killed by nuclear birth of moons
But the aliens already arrived in 1987
nice! 87 a special year indeed!
by Collector
November 22nd, 2019, 10:07 pm
Forum: General Forum
Topic: Central bank backed digital currency
Replies: 1
Views: 473

Central bank backed digital currency

China's digital currency will kick off 'horse race': central bank official "HONG KONG (Reuters) - China’s digital currency will create a “horse race” when it is launched as commercial banks and other institutions compete to provide the best services using the new form of money, a central bank offic...
by Collector
November 22nd, 2019, 9:52 pm
Forum: Off Topic
Topic: News from Outer Space
Replies: 1191
Views: 135829

Re: News from Outer Space

(could even explain the Fermi paradox?)
How so?
intelligent ants killed by nuclear birth of moons
by Collector
November 22nd, 2019, 7:46 pm
Forum: Off Topic
Topic: News from Outer Space
Replies: 1191
Views: 135829

Re: News from Outer Space

NASA Scientists Confirm Water Vapor on Europa https://www.nasa.gov/sites/default/files/artistsconceptmain-full.jpg Source: NASA/ESA/K. Retherford/SWRI ( link ) cool, but looks like we have to wait to 2029 to get contact with life forms there: Jupiter Icy Moons Explorer (JUICE) slated to reach the J...
by Collector
November 22nd, 2019, 7:18 pm
Forum: Off Topic
Topic: Lazarus probabilities are buried alive!
Replies: 54
Views: 6854

Re: Lazarus probabilities are buried alive!

" We were told he’d died of natural causes and we were given the death certificate. His corpse was left in a body bag at the clinic,” his daughter, whose name is not known, said.  The family returned home to Ponedera at around 3pm and called the funeral home to collect the body. “When the undertaker...
by Collector
November 22nd, 2019, 7:08 pm
Forum: Off Topic
Topic: Lazarus probabilities are buried alive!
Replies: 54
Views: 6854

Re: Lazarus probabilities are buried alive!

November 2019  A Texas woman was legally declared dead while still alive "The 73-year-old from Magnolia, Texas, was picking up her prescription from Walgreens when her bank card was declined. She said she knew something was fishy because the card was three months old. So she went to the bank, and af...
by Collector
November 14th, 2019, 6:35 pm
Forum: Off Topic
Topic: Rainwater Collection and Gravity Well Systems: How to?
Replies: 94
Views: 148487

Re: Rainwater Collection and Gravity Well Systems: How to?

My source is 475 about sea level. The biggest danger is sheep staggers (careful now) ... magnesium deficiency and the dead sheep might pollute the water.
so a reasonable chance you will have Smalahove before Christmas then!
by Collector
November 14th, 2019, 5:54 pm
Forum: Off Topic
Topic: Rainwater Collection and Gravity Well Systems: How to?
Replies: 94
Views: 148487

Re: Rainwater Collection and Gravity Well Systems: How to?

Here's a common scenario: farmers need to get rid of slurry, so they spread it on the fields (behind the house).When it rains the slurry seeps into the aquifier and bingo, water source becomes contaminated! https://cdn.mos.cms.futurecdn.net/LSwaGChBCNMxZKr5DryM5j-320-80.jpg Worse is: https://www.sc...
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