Now I would like to create a matrix, with a double entry :
in row : start time
in column : end start
and the values would be the sum of the average. So that for example, if I have in row : 20:00:00, and in column : 03:00:00, my value would be the sum of the averages of 20h, 21h, 22h, 23h, 00h, 01h and 02h.
It would give the whole matrix something like that.