averaging columns in a table based on two other columns

I am importing data from many csv files in a cell and they are tables. each table has 9 columns. They look like this:

Now, I want to average the displacement_pixel_ column for the values that have same y coordinate but move horizontally/ x pixels varying. For example I want to average the displacements for (x,y) = (168,40),(184,40)......(344,40) which will be mean(0.0843,0.01028,........0.3619).

That way I get a one column vector of all displcaemnt averaged over horizonatal direction. It's a 16*16 grid. Would anyone please be able to recommend something?

Thanks.

Answer 1

[Peter Perkins]

This should be straight-forward using either groupsummary, or varfun with displacement_pixel as the input/data variable and x_pixel as the grouping variable. I don't know where 16*16 figures into this, I don't know what you want to do across tables.