how to resolve dimension mismatch issue in expression editor

[godpaul]

Nx8.5

Hi all,

I am trying to do an experiment which uses "diameter" to determine the value of "angle" as shown in picture.

however, it says dimension mismatch...

my understanding is the If statement offers condition, it has nothing to do with caluclation in the "to do' right? why it says dimension mismatches, how to resolve? thank you

 

[cowski]

Any numbers without units in the expression are assumed to be the same as the expression's units; therefore it assumes you are comparing a distance with an angle. To correct this, add units to the comparison value:

if (diameter < 5mm) (15) else (20)

If the "5" represents inches, then use "5in" instead...

Alternately, you could set up another expression value to define the changeover point. Something like:
cutoff (units: length), value: 5
then the angle expression would be:

if (diameter < cutoff) (15) else (20)

www.nxjournaling.com

 

[godpaul]

problem solved!!

And another question arises..

if I wrote:

if (diameter > 0mm && diameter <=5mm) (10)
else if (diameter > 5mm) (25)

error says; the specified string contains syntax error
error here: else if ( diameter > 5mm) (25);

thanks again

 

[godpaul]

think found the problem i need to add "else' statement after "else if"...am i correct?

if (diameter > 0mm && diameter <=5mm) (10)
else if (diameter > 5mm) (25)
else
(30)

 

[cowski]

Put parentheses around the entire 2nd If clause.

 if (diameter > 0mm && diameter <=5mm) (10) else (if (diameter > 5mm) (25) else (30))[highlight #FCE94F])[/highlight]

Do you anticipate negative diameter values? If not, your expression can be simplified to:

if (diameter <= 5mm)(10)else(25)

www.nxjournaling.com

 

[godpaul]

Hi cowski,

i copied pasted your code to the editor but doesnt work, it gives this error ( see picture)

what i am doing now is try to get a feel of the if-else statement in the NX expression editor, has nothing to do with any modeling, just try to learn its syntax.

 

[cowski]

Looks like a copy & paste error. Get rid of the semicolon at the end of your expression.

www.nxjournaling.com

 

[godpaul]

here is the file

 

[godpaul]

no, i didnt type the semicolumn, dont know why the dialog says so itself...

 

[cowski]

Your file and my expression works for me. Try again, because you introduced an error somewhere...

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[godpaul]

could you send back the file you revised with your code, let me see what happen, i still got the same error...

 

[cowski]

My fault, I originally forgot the "else (30)" part.

www.nxjournaling.com

 

[godpaul]

never mind!!
NX epxression editior kind of different from VB syntax and Excel syntax, need to get used to it