Finding change in a feature's attributes

Hi,

 

 

Two AttributeCreators do that without exploding features.

 

In the first one, create an attribute (e.g. named "count"), and set 0.

 

In the second one, set 10 conditional value settings to count changes between every adjacent two attributes.

 

count = If CODE01 != CODE00 Then count + 1 Else <No Action>

 

count = If CODE02 != CODE01 Then count + 1 Else <No Action>

 

...

 

count = If CODE10 != CODE09 Then count + 1 Else <No Action>

 

 

Since the AttributeCreator evaluates every expression in the order from top to bottom, finally the "count" attribute will store the number of changes. 

 

 

But it may be too tedious. Python or Tcl scripting could be better solution.

 

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# Script Example for PythonCaller

 

def countChange(feature):

 

    count = 0

 

    v0 = feature.getAttribute('CODE00')

 

    for i in range(1,11):

 

        v1 = feature.getAttribute('CODE%02d' % i)

 

        if v1 != v0:

 

            count += 1

 

        v0 = v1

 

    feature.setAttribute('_count', count)

 

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# Script Example for TclCaller

 

proc countChange {} {

 

    set count 0

 

    set v0 [FME_GetAttribute "CODE00"]

 

    for {set i 1} {$i < 11} {incr i} {

 

        set v1 [FME_GetAttribute "CODE[format %02d $i]"]

 

        if  {$v1 != $v0} {incr count}

 

        set v0 $v1

 

    }

 

    return $count

 

}

 

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Takashi