Fortran Programming Language :: What does this error mean?


	What does this error mean? my program can pass the compile and link. but when I execute it, the dos window shows the following error: =================== run-time error M6201: MATH -sqrt: DOMAIN error Image PC Routine Line Source GSR.exe 004146B9 unknown unknown unknown kernel32.dll 7C816FD7 unknown unknown unknown Incrementally linked image--PC correlation disabled =================== I don't know how to do with the above information. Thanks in advance for your help. Thanks, Wenbin On 3 mei, 09:42, Wenbin Hu <h@ecn.purdue.edu> wrote: - Hide quoted text - > my program can pass the compile and link. but when I execute it, the > dos window shows the following error: > =================== > run-time error M6201: MATH > -sqrt: DOMAIN error > Image PC Routine Line Source > GSR.exe 004146B9 unknown unknown unknown > kernel32.dll 7C816FD7 unknown unknown unknown > Incrementally linked image--PC correlation disabled > =================== > I don't know how to do with the above information. Thanks in advance > for your help. > Thanks, > Wenbin Most probably, since the error message indicates that it failed with the intrinsic function sqrt, you are trying to take the square root of a negative number. Look in your source code for places where sqrt() is used. Then try to identify if there are situations where its argument might be negative. (One thing to watch out for: if you are computing the standard deviation of a series of data, then sqrt( sum_of_squares - sum**2) _can_ give problems. This is the case if the values are all the same and numerical errors due to finite precision make the difference a very small negative number. It is a situation that I have seen on several occasions in my own code) Regards, Arjen On May 3, 5:42 pm, Wenbin Hu <h@ecn.purdue.edu> wrote: - Hide quoted text - > my program can pass the compile and link. but when I execute it, the > dos window shows the following error: > =================== > run-time error M6201: MATH > -sqrt: DOMAIN error > Image PC Routine Line Source > GSR.exe 004146B9 unknown unknown unknown > kernel32.dll 7C816FD7 unknown unknown unknown > Incrementally linked image--PC correlation disabled > =================== > I don't know how to do with the above information. Thanks in advance > for your help. > Thanks, > Wenbin Your program GSR.exe, compiled from GSR.FOR has failed while executing the SQRT function. It may be that the argument is negative since the message shows "- sqrt". You also have a kernel32.dll external rourine, which should be called during the execution before using it in your main program. It appears your compiler is capable of reporting the routine and line number where the program fails, but the option has not been turned on