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Hello,

 

 

I have a many objetcs with a list (LIST_A) with N elements and a list attribute ATTR_1, i would like to know a smart way to do a expression evaluation on ATTR_1 on all elements of the list (without doing list explode doing the calculation with expression evaluator and doing a list builder).

 

 

Thanks in advance.
Depending on the expression needed the list based transformers can be used. Although the possibilities are not great  certain statistics and simple expressions can be done .
For example a simple one, like multiply by 2 the ATTR_1 on all elements of the list.

 

 

I would use PythonCaller when it's desirable to avoid list explosion.

 

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# Python Example

 

# Assume every list element can be interpreted as numeric value.

 

import fmeobjects

 

def multiplyBy2(feature):

 

    for i, value in enumerate(feature.getAttribute('MyList{}')):

 

        feature.setAttribute('MyList{%d}' % i, float(value) * 2)

 

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