Hello ANsys experts,

Could someone help me with the below queries in MAPDL please?

1. How to output an integer by formatting as per the required digits
   after the decimal. For example (12/19) = 0.6315789474 in APDL for which
   I would like to have the output with 20 digits after the decimal.

2. How to write two to three conditions in an *if statement. For
   example, the condition
   (*if,a,gt,b-tol,and,a,lt,b+tol,or,b,gt,c-tol,and,b,lt,c+tol,then) gives
   me an error where my requirement is if a=b or c=b then with tolerance
   for b and c it should execute the following statements and so on.

Kindly let me know how to move forward.

Thanks & Regards,
Shravani Bojja
FUAS

Shravani,

1. How to output an integer ... I would like to have the output with 20 digits after the decimal.

Check out the *vwrite command, https://www.padtinc.com/2012/05/18/writing-text-files-with-vwrite/

20 digits after the decimal is meaningless as the computer does not store numbers to that precision.  If ANSYS is storing results as a 32-bit number, the most you can get is 6-8 digits of precision and anything after than that is lost in rounding errors.  Reference this Stack Overflow question for more details:  https://stackoverflow.com/questions/13542944/how-many-significant-digits-do-floats-and-doubles-have-in-java

2. How to write two to three conditions in an *if statement

Break it into multiple *if statements using THEN.  You may need to get creative by assigning intermediate Boolean operations to a variable.  I don't write APDL much, but I program a lot in other languages so others on the list may have a better answer.

*if,a,gt,b-tol,THEN
*if,a,lt,b+tol,THEN
...
*endif
*endif

Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.com

Shravani,

Regarding *IF question, Aaron's approach is usually used and the most general since it can nest up to 20 levels.

However, *IF handles two conditions combined through AND, OR or XOR. For example :

*IF,a,gt,b-tol,AND,a,lt,b+tol,THEN

...

*ENDIF

David Galindo

Chief Executive

PHAREA - 213 rue de Gerland - 69007 Lyon - France

-----Message d'origine-----
De : Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org
Envoyé : lundi 28 novembre 2022 15:14
À : XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc : Caba, Aaron (US) Aaron.Caba@baesystems.com
Objet : [Xansys] Re: Formatting in APDL

Shravani,

1. How to output an integer ... I would like to have the output with 20 digits after the decimal.

Check out the *vwrite command, https://www.padtinc.com/2012/05/18/writing-text-files-with-vwrite/

20 digits after the decimal is meaningless as the computer does not store numbers to that precision.  If ANSYS is storing results as a 32-bit number, the most you can get is 6-8 digits of precision and anything after than that is lost in rounding errors.  Reference this Stack Overflow question for more details:  https://stackoverflow.com/questions/13542944/how-many-significant-digits-do-floats-and-doubles-have-in-java

2. How to write two to three conditions in an *if statement

Break it into multiple *if statements using THEN.  You may need to get creative by assigning intermediate Boolean operations to a variable.  I don't write APDL much, but I program a lot in other languages so others on the list may have a better answer.

*if,a,gt,b-tol,THEN

*if,a,lt,b+tol,THEN

    ...

*endif

*endif

Aaron C. Caba, Ph.D.

Sr. Principal R&D Engineer

BAE Systems, Inc.

4050 Peppers Ferry Road, Radford VA 24143-0100 www.baesystems.comhttp://www.baesystems.com _______________________________________________

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