how to modify attribute value 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 attribute total and 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 Attributes operator will create a new attribute. so for above example, I should delete "total" attribute later.