How to replace value in a matrix without affecting total row

[eppydee]

Hi all, 

I have data and created a summary matrix of vaccinated and registered pets by pet type. I created a measure % Registered Pets Vaccinated to replace the values of Pet Type= Unknown to --. However, this replaced my total row value to -- as well. How can I replace the value if the Pet Type=Unknown but keep the total row untouched?

percent_registeredpetsvaccinated = if(contains('Data',[Pet Type],"Unknown"),"--",divide([number_vaccinated],[number_pets]))

Current output:

Pet Type	Number Vaccinated	Number of Registered Pets	Percent Registered Pets Vaccinated
Cat	5	6	83%
Dog	10	11	91%
Unknown	2	4	--
Total	17	21	--

Desired output:

Pet Type	Number Vaccinated	Number of Registered Pets	Percent Registered Pets Vaccinated
Cat	5	6	83%
Dog	10	11	91%
Unknown	2	4	--
Total	17	21	81%

[PaulDBrown · Accepted solution]

Try:

% Registered Pets vaccinated =
VAR _Vacc =
    DIVIDE (
        SUM ( 'Table'[Number Vaccinated] ),
        SUM ( 'Table'[Number of Registered Pets] )
    )
RETURN
    IF ( SELECTEDVALUE ( 'Table'[Pet Type] ) = "Unknown", BLANK (), _Vacc )

[eppydee]

@PaulDBrown Thanks so much, really appreciate it! This worked, the only edit I did was I replaced blank() with "--".

[Greg_Deckler]

@eppydee First, please vote for this idea: https://ideas.powerbi.com/ideas/idea/?ideaid=082203f1-594f-4ba7-ac87-bb91096c742e

This looks like a measure totals problem. Very common. See my post about it here: https://community.powerbi.com/t5/DAX-Commands-and-Tips/Dealing-with-Measure-Totals/td-p/63376

Also, this Quick Measure, Measure Totals, The Final Word should get you what you need:
https://community.powerbi.com/t5/Quick-Measures-Gallery/Measure-Totals-The-Final-Word/m-p/547907

Also: https://youtu.be/uXRriTN0cfY
And: https://youtu.be/n4TYhF2ARe8

[eppydee]

@Greg_Deckler Thank you so much, I bookmarked those tutorials for future reference!