Custom "Totals" row for matrix

[RPYee]

I have a Matrix that shows the most current 13 weeks of data for six different departments, with varying categories for each. 

The image I'm attaching is one of the departments with each column representing one of the categories specific to this department and also the total for each week.

The end users are wanting to see the % change between the most current week with the previous week.  

I'm able to create a whole new matrix with just that calculation and place it at the bottom of the existing matrix, as shown below:

The problem with doing it this way is that some of the departments have up to 20 categories and the columns of the two visualizations do not stay consistently spaced and it gets ugly.

Is there any way I could get the original matrix to include the calculation in what would normally be utilized as a row for totals, had I chosen that option?  I'd like it to be able to update the total row with the rest of the matrix to keep everything aligned, such as in the altered image I created below:

Thanks, in advance, for any assistance you can provide!

[lbendlin · Accepted solution]

yes, that's what HASONEVALUE is for.  Remember that a measure is calculated four times in a matrix visual - cell, row total, column total, and grand total.

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