MATLAB: How to change data

loopspuzzlerunlength

i have a matrix like this: [1 0 0 1 1 1 1 0 1 1 0]

i need to change to: [1 0 0 4 4 4 4 0 2 2 0]

how to make a loop?thanks

Best Answer

Improve my previous code speed three times

x=[1 0 0 1 1 1 1 0 1 1 0]
a=find(x);
b=[ 1 diff(a)];
b(b==1)=0;
b(b~=0)=1;
idx=zeros(numel(a),2);
e=1;
c=0;
d=[];
for k=1:numel(a)
    e=e+b(k);
    c=c*not(b(k))+1;
    d(c)=a(k);
    idx(e,:)=[d(1) c];
end
for k=1:e
    x(idx(k,1):idx(k,1)+idx(k,2)-1)=idx(k,2);
end

Related Solutions

MATLAB: How to find a vector in a matrix

    A=[1 1 1 1; 1 1 2 3; 1 2 3 1; 1 1 1 2];
    B=[1 2 3]; 
    [j,i]=ind2sub(fliplr(size(A)),  strfind(reshape(A.',1,[]),B).' );
    >> [i,j]
    ans =
         2     2
         3     1

MATLAB: Autofilling a matrix with 0’s

One possibility:

A=[1 1 1];
B=[2 3];
C = zeros(size(B,2), size(A,2));
C(1,:) = A;
C(2,1:size(B,2)) = B;
C =
       1     1     1
       2     3     0

A function to do this is:

function C = matcreate(varargin)
nrow = nargin;
ncol = 1;
for k1 = 1:nrow
    len(k1) = length(varargin{k1});
    ncol = max(len(k1), ncol);
end
C = zeros(nrow,ncol);
for k1 = 1:nrow
    C(k1,1:len(k1)) = varargin{k1};
end
end
A=[1 1 1];
B=[2 3];
C  = matcreate(A,B)

Best Answer

Related Solutions

MATLAB: How to find a vector in a matrix

MATLAB: Autofilling a matrix with 0’s

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