**From:** Alberto Fasso' (*fasso@SLAC.Stanford.EDU*)

**Date:** Thu Jul 19 2007 - 11:27:13 CEST

**Previous message:**Markus Brugger: "RE: SCORE and energy conservation"**In reply to:**Helmut Vincke: "Strange output format"**Next in thread:**Helmut Vincke: "RE: Strange output format"**Reply:**Helmut Vincke: "RE: Strange output format"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ] [ attachment ]

Hi Helmut,

*> During an activation calculation I encountered a result in the ASCII
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*> output file which was "6.4308-100". I think I am not the first who had
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*> such a result and therefore I found it worth being discussed in the
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*> discussion list.
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*>
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*> I assume it should be "6.4308E-100"
*

No, it is correct according to the Fortran standard. See it in

http://www.fortran.com/fortran/F77_std/rjcnf0001-sh-13.html#sh-13.2.1 :

The Ew.d, Dw.d, and Ew.dEe edit descriptors indicate that the external field

occupies w positions, the fractional part of which consists of d digits,

unless a scale factor greater than one is in effect, and the exponent part

consists of e digits. The e has no effect on input. The form of the output

field for a scale factor of zero is:

[+] [0] . x x ...x exp

* where: + signifies a plus or a minus ( 13.5.9)

..........

* exp is a decimal exponent, one of the following forms:

For a descriptor Ew.d: form of the exponent E+z1z2 or +0z1z2 (!!!) (if

|exp|<=99)

+z1z2z3 (if 99<|exp|<=999) (note that this is your case)

For a descriptor Ew.dEe: form of the exponent +z1z2z3 or E+z1z2...ze

For a descriptor Dw.d: form of the exponent D+z1z2 or E+z1z2 or +z1z2 (if

|exp|<=99)

+z1z2z3 (if 99<|exp|<=999) (your case)

where z is a digit. The sign in the exponent is required. A plus sign must

be used if the exponent value is zero.

As you can see, the form "6.4308E-100" that you suggest, cannot be used if

the descriptor is of the type Dw.d or Ew.d. It could be used with Ew.dE3,

but this form is very rare in my experience.

*> In post processing programs it could cause troubles. Either it is seen
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*> as expression and the result is seen as -93.57, or the program crashes.
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*> In the first case it might even go unnoticed resulting in bad results.
*

Only if your post processing program is not in Fortran. For a Fortran

post processing program, there can be no problem.

Alberto

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