How do I concatenate cell arrays and line up the rows according to matching items in a column?

Hi,

I have a few arrays (results from different tests) that all have the same first column (list of the participant IDs that performed the tests) which I want to combine into one large array. The thing is I dont know how to add them together and make sure that the rows match up according to the participant IDs.

If I use

high_questionnaires = horzcat(high_loc_ID_factors, high_empathy_ID_factors, high_itc_sopi_ID_factors)

then I get a cell array where the rows arent lined up correctly (see "high_concatenated").

Help is much appreciated!