how to generate an attribute with abs(col1 - col2)

User: "blatoo"
blatoo
New Altair Community Member
Updated by Jocelyn
Hello,

how can I generate an new attribute, which function expression is: |attr1 - attr2| ?

At moment, i just find the way with if( attr1 - attr2 > 0, attr1 - attr2, attr2-attr1)

Thanks very much for the attention!

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    User: "Marco_Boeck"
    Marco_Boeck
    New Altair Community Member
    Hi,

    because there is no explicit function to get absolute values at the moment, I'd suggest the following: 

    sqrt(pow((attr1-attr2), 2))
    Edit: I concede! See Marius' answer below ;)

    Regards,
    Marco
    User: "MartinLiebig"
    MartinLiebig
    Altair Employee
    you can use the sign function 

    sgn(a-b)*(a-b)
    for some reason that one is not in the list of Generate Attributes.
    User: "MariusHelf"
    MariusHelf
    New Altair Community Member
    blatoo,

    why not simply use your subject line?
    abs(attr1-attr2) will also work perfectly in Generate Attributes :)

    ~Marius
    User: "blatoo"
    blatoo
    New Altair Community Member
    OP
    Hi all,

    Thanks very much for the answers! :-) I got now more solutions. But I think, if rapidminer can put the abs() also in the function list, will be better. Because abs() will be often used. ;)
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