Logarithm on Attributes

norita
New Altair Community Member
Hi!
I wanted to obtain logarithm on my attributes. I used the operator logarithm. I was missing the ability of the operator to handle 0 values within attributes. That's a problem for the logarithm function. I thought it might could handle this but I am not sure if the operator can?
Maybe I have to use than a macro right to type in this formula: log(x + 1) because with this formula it could handle 0.
Best
Nora
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Best Answer
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Hi Nora,
There is probably a better way to do it, but you could wrap the Generate Attributes in a Loop Attributes with reuse results enabled.
Greetings,
Jonas1
Answers
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Hi Nora,
i know it's not mathematically correct, but i think the operator follows IEEE 754 and does return -Infinity for +/-0.
But anything below will be converted into a missing value.
Greetings,
Jonas
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Yes that is true but unfortunate for good predictiors I think.Thats why I will do it manually by generating the logarithm by this formula log(x + 1). Do you know how I can perform this for a subset of attributs to generate such logarithmic attributes?
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So I am able to do it for one attribute. But how about doing this on a subset of attributes? Is there a quick way to do it?
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Hi Nora,
There is probably a better way to do it, but you could wrap the Generate Attributes in a Loop Attributes with reuse results enabled.
Greetings,
Jonas1 -
Hi there,you need to combine it with Loop Attributes to get it going.Best,Martin0