# MATLAB: How to conditionally merge rows in a table

MATLAB

Hi,
I have a quick question – I have the following table T and I would like to merge the rows where the values of the variables lat, lon and id are identical and where only the values of the key variable are different. The desired output is shown.
lat = [45.67, 45.67, 56.89, 78.61]';lon = [-66.45, -66.45, -65, -67]';id = [202, 202, 201, 200]';key = {'A', 'B', 'C', 'C'}';T = table(lat, lon, id, key)[C, ia, ic] = unique(T(:, 1:3),'rows')% desired output:lat = [45.67, 56.89, 78.61]';lon = [-66.45, -65, -67]';id = [202, 201, 200]';key = {'A, B', 'C', 'C'}';desired_output = table(lat, lon, id, key)
Thank you,

lat = [45.67, 45.67, 56.89, 78.61]';lon = [-66.45, -66.45, -65, -67]';id = [202, 202, 201, 200]';key = {'A', 'B', 'C', 'C'}';T = table(lat, lon, id, key)T = 4x4 table     lat      lon      id      key
_____    ______    ___    _____

45.67    -66.45    202    {'A'}
45.67    -66.45    202    {'B'}
56.89       -65    201    {'C'}
78.61       -67    200    {'C'}
[C, ia, ic] = unique(T(:, 1:3),'rows');C.key = splitapply(@(s)join(s,', '),T.key,ic)C = 3x4 table     lat      lon      id       key
_____    ______    ___    ________

45.67    -66.45    202    {'A, B'}
56.89       -65    201    {'C'   }
78.61       -67    200    {'C'   }