Hi everyone,
I use the write(7,*) command to debug the UMAT subroutine, and I have a weird problem with that. In part of the code, when I use this command, a negative eigenvalue warning message is shown in the message file and the solution does not converge. But when I delete this command. The solution is done completely. How using the write(7,*) command can affect the solution?
The solution information table in both states is attached for more details.
Best Regards
can you share this part of the code where write(7,*) command is used
Khaled Megahed Of course. thank you.
This is a part of the code that I am using this command, but I should notice that this problem is in each line of the code.
also, when I add
xmr = xmr
before 'write(7,*)' command, the subroutine works properly.
I didn't see any thing wrong in your code
try using write(*,*) instead write(7,*) especially when you need to print solution variables and use write(7,*) for displaying warnings or errors
the data written by write(*,*) can be displayed in (job_name).log file
Khaled Megahed yes I tried using print*, or write(*,*) to write the solution variables and the problem didn't solve again.
thanks a lot.
Dear Zk Sun, I noticed that this problem occurs when you assign a value to an undefined index in an array. For example:
REAL*8 A(2)
A(3) = 15.0D0
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