We have three matrixes which are pretty much identical. The first two matrixes asks for users to input their data. The thrid matrix however takes the values from the first two matrix and adds them up by the row and column.
Below is a visual example. Also attached is the json and an image
Matrix 1
<xxx> <1c1> <1c2> <1c3>
<1r1> <1d1> <1d2> <1d3>
<1r2> <1d4> <1d5> <1d6>
Matrix 2
<xxx> <2c1> <2c2> <2c3>
<2r1> <2d1> <2d2> <2d3>
<2r2> <2d4> <2d5> <2d6>
Matrix 3
<xxx> <3c1> <3c2> <3c3>
<3r1> <1d1 + 2d1> <1d2 + 2d2> <1d3 + 2d3>
<3r2> <1d4 + 2d4> <1d5 + 2d5> <1d6 + 2d6>
I've prepared a working sample for you
https://plnkr.co/edit/Tdmh1U?p=preview
Thanks, Serge
SurveyJS Team