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FORTRAN sqrt:DOMAIN error

rhballou
Beginner
‎06-01-2010 08:39 AM
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I am running a program under Windows 7 with Compaq Visual Fortran version 6.6B containing a square-root function. The M6201:MATH sqrt:DOMAIN run-time error occurs. I have verified that thevalue of the variable sentto the DSQRT functionis positive and the variable is REAL*8. The QuickWin library is used. Are there other reasons besides a negative argument that can cause the error?
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Jugoslav_Dujic
Valued Contributor II
‎06-01-2010 11:50 AM
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A NaN (or possibly also Inf) would also trigger it, if I recall correctly.
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rhballou
Beginner
‎06-01-2010 12:11 PM
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Thanks for reply. I am not familiar with NaN. Can it be corrected or how is it treated?
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Jugoslav_Dujic
Valued Contributor II
‎06-01-2010 05:03 PM
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NaN comes as result of floating-point operation which has undefined result. The most common case is 0./0., and there are other possibilities, such as Inf/Inf, Inf*0., etc.

Why don't you run your program through debugger, and find out for yourself?
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