DAX Question - only peform operation where there is data available?

[Anonymous]

Hello Power BI Pals!

I have a DAX question - all I want to do is to subtract 1 from each of these USG% figures,  so I can have a table like this:

Jan-20 0.39
Feb-20 0.42
Mar-20 0.52

etc
However, as you can see below, if I try to just subtract one, I get a minus 1 for all the other days in the month that don't have any data.

Can I force it to ignore all the other days in the month, and just do on the day which has data (which is always the first of the month, e.g. 01/01/2020

Thank so much!

Alex

[AlB · Accepted solution]

Hi @Anonymous 

USG% =
VAR res_ =
    DIVIDE ( A, B ) //This will return blank when there is no data
RETURN
    IF ( NOT ISBLANK ( res_ ), res_ - 1 )

A and B are the numerator and denominator that you have...

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Cheers 

[Anonymous]

That works great - thanks! 🙂