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REAL*10

 
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DanRRight



Joined: 10 Mar 2008
Posts: 1649
Location: South Pole, Antarctica

PostPosted: Sat Mar 11, 2017 9:30 am    Post subject: REAL*10 Reply with quote

"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: 5046
Location: Salford, UK

PostPosted: Sat Mar 11, 2017 10:30 am    Post subject: Reply with quote

I don't have any immediate suggestions relating to FTN95.
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JohnCampbell



Joined: 16 Feb 2006
Posts: 1835
Location: Sydney

PostPosted: Sat Mar 11, 2017 11:22 am    Post subject: Reply with quote

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: 144

PostPosted: Sat Mar 11, 2017 2:09 pm    Post subject: Reply with quote

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: 739

PostPosted: Sat Mar 11, 2017 4:28 pm    Post subject: Reply with quote

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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