MATLAB: Simple question

vector

I have a array of 1's and -1's. The data is in the format of S =[ 1 1 1 1 1 -1 -1 -1 -1 1 1 1 1]

It is always changing between 1 and -1. Could somebody give me code on how to quantify howmany time it changes from on to the other. Additionally is it possible somebody could give the average of 1's per time 1's occur and average -1's per time -1's occur.

Best Answer

using

ChangesN = find(diff(S))

would demonstrate where the value was changing and then to see how many time this happens:

length(ChangesN)

Related Solutions

MATLAB: How to create a matrix out of all the possible combinations of a vector

Please see answer by Roger Stafford.

In your case:

a = 3:5;
v = [0,-1,1];
n = cumsum(a,'reverse');
C1 = nchoosek(1:n(1),a(1)); % Here are the two calls on 'nchoosek'
C2 = nchoosek(1:n(2),a(2));
M = ones(size(C1,1)*size(C2,1),n(1)); % First, fill M with all 1's
k1 = 0;
for k2 = 1:size(C1,1)
    p1 = C1(k2,:); % Use C1 to generate indices for inserting 0's
    q1 = 1:n(1);
    q1(p1) = [];  % These indices will point to -1 and 1 locations
    for k3 = 1:size(C2,1)
        p2 = C2(k3,:); % Use C2 to generate indices for inserting -1's
        k1 = k1 + 1; % Advance the row index of M
        M(k1,p1) = v(1); % Insert  0's
        M(k1,q1(p2)) = v(2); % and  -1's
    end
end

MATLAB: How to find correlation between the row values of a matrix

D=[1 1 0 0 1;1 0 0 0 0;1 1 1 1 0;0 0 0 1 0;0 1 1 1 1]
for k=1:size(D,1)-1
      res{k}=sum(bsxfun(@eq,D(k+1:end,:),D(k,:)),2)
end
celldisp(res)

Best Answer

Related Solutions

MATLAB: How to create a matrix out of all the possible combinations of a vector

MATLAB: How to find correlation between the row values of a matrix

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