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I am attempting to calculate the length in miles of line segments using the following 

 

(@Value(END_MEASURE)-@Value(BEGIN_MEASURE))/5280

 

 

I am receiving a warning as follows

 

 

ExpressionEvaluator_5: Failed to evaluate TCL expression: (-)/5280

 

ExpressionEvaluator_5: TCL Error Message: missing operand at _@_

 

in expression "(-_@_)/5280"

 

FileGDB Writer: The `Mileage' attribute could not be written. The containing feature has been dropped

 

 

If I remove the division I do not get the error.  I need to division to happen as the output needs to be in miles not feet.

 

 

thanks

 

Dan
Hi,

 

 

One or more inputs are EMPTY/MISSING/NULL.

 

In this case "(-)/5280" both operands are so.

 

 

TCL cannot handle an empty attribute in a expression.

 

This is because any expression is basically a string that will be parsed. An empty attribute results in an "empty" spot in the string wich causes a parsing error.

 

 

You must test for EMPTY/MISSING/NULL on all operands before sending thme to the ExpressionEvaluator.

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