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Return largest parameter value in scripted parameter (possible bug)

  • April 1, 2024
  • 2 replies
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dustin
Influencer
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 I have 3 published parameters where the user inputs values for buffers. All three were created as Numeric parameters, with numeric precision set to Integer. I would like to extract the largest buffer value in a python scripted parameter. This is the code I’m using in FME 2023 (build 23332)

buffer_list = [FME_MacroValues['BUFFER1'],FME_MacroValues['BUFFER2'],FME_MacroValues['BUFFER3']]
buffer_list.sort(reverse = True)

return buffer_list[0]

What I’ve discovered is that if the 3 buffers are the same number of digits, the script will return the correct value. If the number of digits is different, it will not. Some examples:

10, 40, 50 = 50 (correct)

120, 60, 70 = 70 (incorrect)

120, 180, 70 = 70 (incorrect)

120, 200, 300 = 300 (correct)

It doesn’t matter which order the values are input, nor does it matter how the parameters are sorted in the parameter list.

Is this a bug, or am I missing something?

Best answer by debbiatsafe

Hello @dustin,

Parameter values are always fetched as strings. You will need to cast the parameter values to integers if you need to get the numerical max.

return max(int(FME_MacroValues['BUFFER1']),int(FME_MacroValues['BUFFER2']),int(FME_MacroValues['BUFFER3']))

Note the original behaviour noted is not a behaviour specific to FME. I believe strings are sorted based on code-point value of the first character.

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    2 replies

    debbiatsafe
    Safer
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    • debbiatsafeSafer
    • Safer
    • Best Answer
    • April 2, 2024

    Hello @dustin,

    Parameter values are always fetched as strings. You will need to cast the parameter values to integers if you need to get the numerical max.

    return max(int(FME_MacroValues['BUFFER1']),int(FME_MacroValues['BUFFER2']),int(FME_MacroValues['BUFFER3']))

    Note the original behaviour noted is not a behaviour specific to FME. I believe strings are sorted based on code-point value of the first character.

    hkingsbury
    mark2atsafe
    dustin
    Influencer
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    • dustinInfluencer
    • Author
    • Influencer
    • April 2, 2024

    Hello @dustin,

    Parameter values are always fetched as strings. You will need to cast the parameter values to integers if you need to get the numerical max.

    return max(int(FME_MacroValues['BUFFER1']),int(FME_MacroValues['BUFFER2']),int(FME_MacroValues['BUFFER3']))

    Note the original behaviour noted is not a behaviour specific to FME. I believe strings are sorted based on code-point value of the first character.

    This worked great, thank you.

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