如何修改属性价值e in one exampleset based on some condition

Lei

I have two examplesets. I check if attribute value in second exampleset inside attribute in first exampleset. then I want to add some data to a new attribute in first exampleset based on comparsion


exampleset first: exampleset second:
id word total id word rate
1 cat 3 1 cat 2
2 dog 5 2 cattle 8
3 rat 4
4 pig 3
5 fish 6

compare word attribute of two examplesets, and find "cat" in both exampleset "word" attribute. so I want my result likes:

exampleset first:
id word total new_total
1 cat 3 6
2 dog 5 5
3 rat 4 4
4 pig 3 3
5 fish 6 6

the "new_total" are calculated by "total"*"rate" if words exsit in both exampleset, otherwise copy "total" to "new_total".


Could someone tell me which operator I should use?
Thank you very much.

MartinLiebig

Hi,

looks like you want to left join the second on the first, replace mssings on the rate with 1 andthen use Generate Attributes to generate your product.

Best,

Martin

MartinLiebig

Hi,

you can just name the newly generated attributetotaland it then overwrites the old one with the new one.

Best,

Martin

Lei

Thank you Mschmitz.
your answer is very helpful.

I have another question. If I do not generate"new_total"attribute in above example, just modify the first exampleset"total"attribute with"total"*"rate"when words exsit in both examplesets, is there any other operator I can use?Generate Attributesoperator will create a new attribute. so for above example, I should delete "total" attribute later.