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DanRRight
Joined: 10 Mar 2008
Posts: 2863
Location: South Pole, Antarctica
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 Posted: Sat Mar 11, 2017 9:30 am Post subject: REAL*10 |
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"Error 1210: Extended precision floating point (REAL*10) is not supported
in 64-bit mode"
Any suggestions to get more then real*8 ? |
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PaulLaidler
Site Admin
Joined: 21 Feb 2005
Posts: 8011
Location: Salford, UK
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| Posted: Sat Mar 11, 2017 10:30 am Post subject: |
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| I don't have any immediate suggestions relating to FTN95. |
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JohnCampbell
Joined: 16 Feb 2006
Posts: 2580
Location: Sydney
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| Posted: Sat Mar 11, 2017 11:22 am Post subject: |
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Dan,
You need a real*16 higher precision software emulation library; they must exist. (google quad precision ?)
I have no experience with using these but expect it would be messy and slow !!
I presume you would require a derived type to store the "real*16" variables and have limited access to the calculations.
Would complex(2) provide the storage ?
For simple multiplication and accumulation, see https://en.wikipedia.org/wiki/Kahan_summation_algorithm
This may help.
John |
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simon
Joined: 05 Jul 2006
Posts: 270
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| Posted: Sat Mar 11, 2017 2:09 pm Post subject: |
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| I don't have access to the book right now to check whether it is what you need, but there is a section on "Arbitrary precision" in "Numerical Recipes" |
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mecej4
Joined: 31 Oct 2006
Posts: 1896
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| Posted: Sat Mar 11, 2017 4:28 pm Post subject: |
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See http://crd-legacy.lbl.gov/~dhbailey/mpdist/ for one package that enables multiple precision.
Other compilers have support for REAL*16 using compiler switches.
Multiple precision is not to be chosen without due deliberation and a well-reasoned conclusion that it is necessary. |
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