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

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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Marco_Boeck

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

MartinLiebig

you can use the sign function


sgn(a-b)*(a-b)

for some reason that one is not in the list of Generate Attributes.

MariusHelf

blatoo,

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

~Marius

blatoo

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.