MATLAB: How get row index of first and last appearance each unique cell element

data acquisitionData Acquisition ToolboxMATLAB

Hi,
I have below cell array, and I want to get the unique elements based on 2nd column.
MUY09KT00    TW00.00
MUY09KT00    TW00.00
MUY09KT00    TW00.00
MHJ09KT00    PW00.00
MHJ09KT00    PW00.00
LHJ09KT00    NPW00.00
LHJ09KT00    NPW00.00
LHJ09KT00    NPW00.00
in this case, the unique element first index are:
1
4
6
in this case, the unique element last index are:
3
5
8

Best Answer

Make the output in the "stable" order:
 x = ["MUY09KT00"    "TW00.00"
  "MUY09KT00"    "TW00.00"
  "MUY09KT00"    "TW00.00"
  "MHJ09KT00"    "PW00.00"
  "MHJ09KT00"    "PW00.00"
  "LHJ09KT00"    "NPW00.00"
  "LHJ09KT00"    "NPW00.00"
  "LHJ09KT00"    "NPW00.00"]
[~,~,J] = unique(x(:,2)); % Based on the 2nd column
jump = find([true; diff(J); true]);
first = jump(1:end-1)
last = jump(2:end)-1
first =
       1
       4
       6
last =
       3
       5
       8
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