MATLAB: Splitting a vector into ‘on’ periods

MATLABsignal processingvector

Hi,
I'm investigating data from a force plate (study of balance in people with movement disorders). I have a raw signal such as:
vector = 1 2 3 4 0 0 0 0 5 6 7 4 7 8 0 0 0 1 2 5 4 0 0 0 0 0 5 6
I need to split this signal into separate vectors that only contain sequences of numbers greater than 0. So the ideal result for the above would be:
vector 1 = 1 2 3 4
vector 2 = 5 6 7 4 7 8
vector 3 = 1 2 5 4
vector 4 = 5 6
I hope the question is clear enough. Any help would be greatly appreciated!

Best Answer

I did my best to make this as robust as possible:
vector = [1 2 3 4 0 0 0 0 5 6 7 4 7 8 0 0 0 1 2 5 4 0 0 0 0 0 5 6];
vec_nz = vector > 0;                                        % Non-Zero Elements
dv = diff([0 vec_nz 0]);                                    % Index Vector
on  = find(dv > 0);
off = find(dv < 0);
sections = abs(on-off);                                     % Divide ‘vector’ Here
VectorCell = mat2cell(vector(vec_nz), 1, sections);         % Create Cell
VectorCell{:}                                               % Display Results (Can Be Deleted)
ans =
     1     2     3     4
ans =
     5     6     7     4     7     8
ans =
     1     2     5     4
ans =
     5     6
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