error in logarithm parameter

[Mahmoud_A]

Dear all

when i create log parameter in this family then apply . i see this message

any one can help me???

[ToanDN · Accepted solution]

Because the Air Flow value for that type is 0.  You need to enter some value for it.

Or change the formula to: if(Liner Flow > 0, log(Liner Flow), 0)

[Mahmoud_A]

Dear, ToanDN

Thank You

formula working good,,but changing the value of Air flow not working.

Thanks again

[chrisplyler]

Changing airflow to a positive value DID work. At least for the 2-slot type. If you read that error you'll see that it's now for one of the 3-slot types. You can keep correcting the values, but it's going to keep throwing an error on the next type until you've corrected all of them.

It is best to solve the formula problem so that it handles the zero airflow condition without error anyway. Even if you set default values for airflow of all the types, somebody somewhere can set the value to 0 in a project and it's going to break and show the user one of those "I can't make this family, and I'm not telling you why, you dummy!" error message.

[ToanDN]

@Mahmoud_A

Use the alternate formula I gave you in the earlier post and in the revised family to take care of all the zero Air Flow conditions.

Here it is again:

if(Air Flow > 0, log(Liner Flow), 0)