If you have a 4D array, then to store it in excel, you will need to do one of the following (or a combination)
- write 2D sections to individual files, using size(x,3) * size(x,4) files
- write 2D sections to individual sheets of a file, using size(x,3) * size(x,4) sheets
- write 2D sections to individual sheets, one sheet for each 3rd dimension, one file for each 4th dimension, so size(x,3) sheets per file and size(x,4) files
- reshape() 4D to 2D and write all to one file
- reshape() 4D to 3D and write each plane to a separate sheet or separate file
- re-arrange parts side-by-side so that you get groups of size(x,2) columns, with size(x,3) groups together, for a total of size(x,2) * size(x,3) columns, and using one sheet or one file for each element of the 4th dimension
