UDF: using if

lucioantonio · April 17, 2009, 05:45

dear to all,

i'm trying to use the "if" command in an UDF.
when i interpreted the UDF by Fluent, it wrote:
"invalid expression type for if: double."

the line of the error is the first of this group:

if (Tg=0)
Kr=0;
else {
Kr=qrnet/(Tg);
}

Kr,qrnet,Tg were declared as real.
can someone help me?
best regards to all

O.D.Y. · April 17, 2009, 05:56

hi,

I think you is the if-question! you assign 0 to Tg, but I think the boolean expression is supposed to be:

if (tg == 0.0)

cheers

lucioantonio · April 17, 2009, 06:02

Quote:

Originally Posted by O.D.Y.

hi,

I think you is the if-question! you assign 0 to Tg, but I think the boolean expression is supposed to be:

if (tg == 0.0)

cheers

oh!... it's right!!!... i can't say with words how much i am grateful...
thanks a lot!!!

best regards!

April 17, 2009, 05:45	UDF: using if	#1
lucioantonio New Member Join Date: Apr 2009 Posts: 10 Rep Power: 17	dear to all, i'm trying to use the "if" command in an UDF. when i interpreted the UDF by Fluent, it wrote: "invalid expression type for if: double." the line of the error is the first of this group: if (Tg=0) Kr=0; else { Kr=qrnet/(Tg); } Kr,qrnet,Tg were declared as real. can someone help me? best regards to all

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April 17, 2009, 05:56		#2
O.D.Y. Member Join Date: Mar 2009 Posts: 49 Rep Power: 17	hi, I think you is the if-question! you assign 0 to Tg, but I think the boolean expression is supposed to be: if (tg == 0.0) cheers