How would you loop through a vector and create new vectors (groups) based the condition of similar values per index

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Matter_n_Energy 2022-4-12

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回答： Jean-Baptiste Lanfrey 2022-4-12

Given an input vector

nums =  [1     2     3     1     3     3     1     2     2     3     2     1     3];

I'd like to loop through and create groups such that when an element is repeated, everything before it is a group (new vector). For example, using the vector above, the groups would be:

[1 2 3] [1 3] [3 1 2] [2 3] [2 1 3]

To elaborate, the first group stops at 3 because everthing is unique until that second 1 is reached because it's a repeat of index 1. Then the second group starts at that index for the second 1, reads through and sees that 3 repeats, so everything from that second 1 to the next 3 is a group. Then it starts at the next index...

Basically each group needs to have non-repeating values.

Thanks in advance

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Answer 1

Jean-Baptiste Lanfrey 2022-4-12

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在 MATLAB Online 中打开

Something like this should work.

nums =  [1     2     3     1     3     3     1     2     2     3     2     1     3];
groups{1} = nums(1);
for number = nums(2:end)
  if any(groups{end}-number==0)
    groups{end+1} = number;
  else
    groups{end} = [groups{end} number];
  end
end