google spreadsheet - Pre-populating a column in a row based on related rows -


i have following dataset in google spreadsheet

+-------------------------------------------+------------------+                                         |software name  |operating system           |    multiple os?  |                                         +--------------------------------------------------------------+                                         |office         |windows                    |yes               |                                         |office         |mac                        |yes               |                                         |vmware fusion  |mac                        |no                | |vmware fusion  |mac                        |no                                                                                +---------------+---------------------------+------------------+

i been trying find way automatically populate multiple os field yes/no. should occur when there duplicate software entries different operating systems.

i expected easy problem solve , started messing filter() , countif() shortly after have become quite perplexed how approach this.

=arrayformula(if(len(a2:a),if(isnumber(match(a2:a,filter(a2:a,b2:b<>vlookup(a2:a,a2:b,2,0)),0)),"yes","no"),))

the filter(a2:a,b2:b<>vlookup(a2:a,a2:b,2,0)) produces array of values column have multiple values in b column. isnumber(match()) produce true each value in column exists in array.


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