@TW_Tones , thanks so much for your feedback, actually the reason for using Calc is not its math feature, it’s more due to it’s ability to collapse row/column (as you can imagine, in 2D, when I have a huge list of lab results and different dates/time of the results, the matrix can turn quite big in a very short time, and Calc’s ability to collapse row/column make it more readable. I’ll take a look at your suggestion, it may take a while, since there are a lot to digest. Thanks again for your help.