Windows 10: Announcing Windows 10 Insider Preview Slow Build 17115 - Mar. 6 Insider

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  1.    14 Mar 2018 #140

    Just got a GSOD on the first reboot after attempting install of 17115 on my son's i7-4770K/Asrock Z97 Fatal1ty Killer build. Rebooted again, hit restart in Settings/Windows Update and it went through OK on 2nd try. Weird.
    --Ed--
      My ComputersSystem Spec

  2.    14 Mar 2018 #141

    EdTittel said: View Post
    Just got a GSOD on the first reboot after attempting install of 17115 on my son's i7-4770K/Asrock Z97 Fatal1ty Killer build. Rebooted again, hit restart in Settings/Windows Update and it went through OK on 2nd try. Weird.
    --Ed--
    Some OT quickly (b'cos weirdness is interesting.. )

    Let’s do some basic maths together. Please use your head first. Highlight the next two lines to see the respective answers.
    What is the square root of four? It’s two, isn’t it?
    And what do you get if you subtract two from two? Zero, right?
    Now let’s do the above calculation using the Windows calculator. Type in 4, take the square root and from the result subtract 2. What do you get now?
    Source: 5 Weird Windows Bugs Easter Eggs You Have To See

    Still there with the UWP calc ... even tried squaring the result (thinking the correct answer may be in memory but nope...)

    Windows 10 S mode for schools?... Hmmm
      My ComputerSystem Spec

  3.    14 Mar 2018 #142

    Superfly said: View Post
    Some OT quickly (b'cos weirdness is interesting.. )


    Source: 5 Weird Windows Bugs Easter Eggs You Have To See

    Still there with the UWP calc ... even tried squaring the result (thinking the correct answer may be in memory but nope...)

    Windows 10 S mode for schools?... Hmmm
    There is nothing new in this - all computing languages have worked like this. Basically, the algorithms for calculating square roots use numerical interation to calculate a square root.

    This example uses the most basic algorithm

    Rx new = (X/Rx old + Rx old)/2

    E.g. start with a guess like this

    initial guess Rx old- 1

    so this calculates Rx new as (4/1 + 1)/2 = 2.55

    The Rx old becomes Rx new

    (4/2.5 + 2.5)/2 = 2.05

    (4/2.05 + 2.05)/2 = 2.0006 ( to 4 sig figs)

    Repeat many times and eventually it converges to the lowest precision that the computer can hold for numbers, and for all numbers there will never be an exact convergence, so eventually it will be 1.9999999999999999999999...............................9 or 2.00000000000000.................................1.

    Good old FORTRAN programmers knew about real number machine precision in the 60's!
      My ComputerSystem Spec


  4. Posts : 19,623
    Windows 10 Home 64bit
       14 Mar 2018 #143

    cereberus said: View Post
    There is nothing new in this - all computing languages have worked like this. Basically, the algorithms for calculating square roots use numerical interation to calculate a square root.

    This example uses the most basic algorithm

    Rx new = (X/Rx old + Rx old)/2

    E.g. start with a guess like this

    initial guess Rx old- 1

    so this calculates Rx new as (4/1 + 1)/2 = 2.55

    The Rx old becomes Rx new

    (4/2.5 + 2.5)/2 = 2.05

    (4/2.05 + 2.05)/2 = 2.0006 ( to 4 sig figs)

    Repeat many times and eventually it converges to the lowest precision that the computer can hold for numbers, and for all numbers there will never be an exact convergence, so eventually it will be 1.9999999999999999999999...............................9 or 2.00000000000000.................................1.

    Good old FORTRAN programmers knew about real number machine precision in the 60's!
    And yet there are calculators on the web that can do it try https://web2.0calc.com/
      My ComputerSystem Spec

  5.    14 Mar 2018 #144

    cereberus said: View Post

    Good old FORTRAN programmers knew about real number machine precision in the 60's!
    Thanx.. Yep... can't argue with that!
      My ComputerSystem Spec

  6.    14 Mar 2018 #145

    kado897 said: View Post
    And yet there are calculators on the web that can do it try https://web2.0calc.com/
    Excel has it covered as well...

    Click image for larger version. 

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ID:	180888

    One wonders how much really new code is in Windows 10 (apart from the XAML stuff)?
      My ComputerSystem Spec


  7. Posts : 19,623
    Windows 10 Home 64bit
       14 Mar 2018 #146

    Superfly said: View Post
    Excel has it covered as well...

    Click image for larger version. 

Name:	Capture.PNG 
Views:	3 
Size:	17.1 KB 
ID:	180888

    One wonders how much really new code is in Windows 10 (apart from the XAML stuff)?
    Not a lot I think.
      My ComputerSystem Spec


  8. Posts : 1,534
    WinX Pro x64 IP current
       15 Mar 2018 #147

    IO just tried sqrt(4) -2 on the calc in 17618 - and I get 0.
      My ComputersSystem Spec


  9. Posts : 3,229
    Windows 10 Pro x64 v1803 Build 17134.137 (Branch: RS4 Release Preview)
       15 Mar 2018 #148

    johngalt said: View Post
    IO just tried sqrt(4) -2 on the calc in 17618 - and I get 0.
    So does my over 20 year old calculator do too:
    Click image for larger version. 

Name:	sqrtOf4Minus2.png 
Views:	32 
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ID:	180974
      My ComputersSystem Spec


  10. Posts : 1,534
    WinX Pro x64 IP current
       16 Mar 2018 #149

    I have an HP 48gx lying around somewhere, but not gonna be bothered trying it out. I know the Precision on it is infinitesimally email.
      My ComputersSystem Spec


 
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